<\/span><\/h2>\nWhen managing data within Solr databases, it’s imperative to understand how updates will be managed.<\/p>\n
Keeping in mind this aspect can prevent unnecessary administrative overhead for updating documents over time.<\/p>\n
So unlike relational databases that allow modifications only for specific fields, Solr typically requires updating of an entire document whenever one field changes; there are three approaches to handling updates within Solr that you might consider:<\/p>\n
Updates in Place<\/strong><\/p>\nTwo methods for updating documents directly are available; in-place updates involve sending out new versions while optimistic ones change them directly.<\/p>\n
Both options provide updates at one or multiple fields at the same time without disrupting work flow or using intermediary services for updates behind-the-scenes.<\/p>\n
Behind-the-scenes<\/strong><\/p>\nSolar deletes and recreates documents whenever updates are made to them, to maintain data integrity without losing information in fields.<\/p>\n
To maintain consistency while protecting data integrity. This requires diligent handling from everyone involved.<\/p>\n
Recreating a Document in Its Entirity <\/strong><\/p>\nRecreating an entire document requires users to query for each section, make their changes, and send back to solar. This process could prove challenging in practice and necessitate multiple steps before final approval can occur.<\/p>\n
![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2025\/03\/Key-Components-of-Solr-and-Its-Configuration.jpg\")
<\/p>\n
As part of your document storage in the solar database, it is crucial to consider strategies for handling updates, upgrades and compatibility with relational databases.<\/p>\n
By understanding these strategies, you can ensure your documents stay relevant with current technologies and applications. Within Solr specifically, Atomic updates ensure this.<\/p>\n
<\/span>Atomic updates in Solr<\/strong><\/span><\/h2>\nAtomic updates in Solr allow clients to update specific fields within an existing document without altering its entirety, thus protecting data integrity by only updating relevant fields at once.<\/p>\n
Relational databases often involve updates directly editing records; with Solr however, updates typically involve document deletion and recreate instead, with this process kept out of the client experience to simplify updates.<\/p>\n
Twitter provides an effective example of atomic updates: to update an existing document’s field with updated values, users add it as an index entry with an individual field that needs updating marked for modifications.<\/p>\n
Atomic updates provide greater efficiency and consistency by permitting targeted modifications without necessitating full document replacements.<\/p>\n
For instance, changing the likes count field requires specifying this change via adding a modifier tag to JSON files.<\/p>\n
This approach to updates maximizes efficiency by permitting targeted modifications without necessitating full replacement documents.<\/p>\n
<\/span>Enhancing Search Efficiency with Solr Copy Fields<\/strong><\/span><\/h2>\nSolr Copy Fields Improve Search Efficiency Solr provides efficient search functionality by providing users with one simple box for querying rather than complex forms to fill out.<\/p>\n
This approach increases performance while decreasing complexity associated with document updates.<\/p>\n
To increase Search Efficiency with Solr, its copy fields simplify searching functionality allowing for easier use by end-users.<\/p>\n
Copy Fields provide an effective solution, consolidating data from multiple fields into one search field for seamless searching results when queried information resides across various locations.<\/p>\n
By doing this, searches deliver relevant answers even when information pertaining to it can be stored across several fields.<\/p>\n
By employing Copy Fields, Solr dramatically enhances search accuracy, improves efficiency, and provides a better user experience.<\/p>\n
<\/span>Enhancing Search Efficiency with Catch-All Fields<\/strong><\/span><\/h2>\nEnhancing Search Efficiency with Catch-All Fields Catch-All fields allow Solr to consolidate multiple fields into one field to prevent data storage fragmentation while improving overall efficiency in searches.<\/p>\n
To work correctly, both source and destination fields must be multi-value, with copy field settings accordingly.<\/p>\n
Queries can still be executed without specifying fields; however a default field must still be defined to achieve accurate search results.<\/p>\n
However, using copy fields may increase index size and potentially impact performance.<\/p>\n
An optimized configuration for copy fields helps maintain efficient database management while improving search functionality.<\/p>\n
<\/span>Solr Configuration, Indexing, and Query Execution<\/strong><\/span><\/h2>\nSolr provides users with a way to easily build server-side configuration sets of tech products using its administration console.<\/p>\n
Here users can select core box features before configuring settings to define instance ID\/path pairs for instance ID identification purposes.<\/p>\n
Solr provides an index to index instance check products, then executes queries against it. At first, Solr server remains empty while waiting for data insertion; initial examples can be found under queries and “example\/exampleDocs.<\/p>\n
Using post.jar as a Java library, documents will then be indexed into Solr for indexing and addition.<\/p>\n
![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2025\/03\/Atomic-updates-in-Solr.jpg\")
<\/p>\n
Executing “java -jar” allows us to process and commit XML documents via HTTP to a technical product collection via Solr Administration Console, while verifying their addition through query pages within Solr itself.<\/p>\n
The commit command ensures documents have been successfully added into Solr indexing system while query pages allow users to check this.<\/p>\n
Users can efficiently run queries, access results and explore various query types with the Request Handler’s efficient management of user requests.<\/p>\n
Solr Administration Console offers users a user interface for query execution and data administration for seamless search functionality.<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.9.7″ _module_preset=”default” background_color=”#064399″ use_background_color_gradient=”on” background_color_gradient_start=”#0095f2″ background_color_gradient_end=”#7dbed8″ background_color_gradient_direction=”92deg” background_color_gradient_start_position=”35%” background_color_gradient_end_position=”80%” transform_scale=”73%|62%” transform_scale_linked=”off” transform_translate=”-53px|-50px” transform_translate_linked=”off” link_option_url=”https:\/\/cloudfoundation.com\/blog\/” link_option_url_new_window=”on”][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/06\/SS_436-_Converted_-1.png” _builder_version=”4.9.7″ _module_preset=”default” transform_scale=”114%|112%” transform_scale_linked=”off” transform_translate=”25px|-4px” transform_translate_linked=”off” width=”98.1%” custom_margin=”|7px|||false|false”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ _module_preset=”default” text_font=”Georgia|700|||||||” text_font_size=”23px” text_line_height=”1.3em” header_font=”Georgia|700|||||||” header_font_size=”21px” header_letter_spacing=”-1px” header_line_height=”2em” transform_scale=”171%|159%” transform_scale_linked=”off” transform_translate=”40px|44px” transform_translate_linked=”off” transform_origin=”70%|50%” z_index=”-161″ width=”100%” custom_margin=”|-215px||||” custom_padding=”|0px||||” link_option_url=”https:\/\/cloudfoundation.com\/blog\/” link_option_url_new_window=”on”]<\/p>\n
Apache Solr<\/strong> Training<\/span><\/h1>\n[\/et_pb_text][et_pb_button button_url=”https:\/\/cloudfoundation.com\/blog\/” url_new_window=”on” button_text=”Explore Course Content” _builder_version=”4.9.7″ _module_preset=”default” custom_button=”on” button_text_color=”#0C71C3″ button_bg_color=”#FFFFFF” button_font=”|700|||||||” transform_translate=”64px|65px” transform_translate_linked=”off”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2019\/06\/logo_resize_color.png” _builder_version=”4.9.7″ _module_preset=”default” transform_translate=”-36px|0px” transform_translate_linked=”off” custom_margin=”|||178px||”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.7″ background_size=”initial” background_position=”top_left” background_repeat=”repeat”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.9.7″ text_font=”Georgia||||||||” text_text_color=”#000000″ text_font_size=”22px” text_line_height=”1.9em” max_width=”800px” max_width_last_edited=”off|phone” custom_margin=”|||10%” custom_margin_last_edited=”off|desktop” text_font_size_tablet=”” text_font_size_phone=”” text_font_size_last_edited=”on|phone” text_line_height_last_edited=”off|phone”]<\/p>\n
<\/span>How to install and run Solr on a Local machine<\/strong><\/span><\/h2>\nSolr Performance on Local Machines Solr performance depends upon several variables, including field copy count and destination field count as well as available disk space on local machines.<\/p>\n
Ample disk space must be available to ensure smooth operations of Solr on local machines.<\/p>\n
MaxChars sets an upper limit for how many characters will be copied from source fields to the index file size, helping maintain control.<\/p>\n
Install and run Solar on a local machine, create a solar core or collection, index documents for searching purposes, send queries over HTTP using curl and complete this tutorial with an overview of its administration console.<\/p>\n
Solar is not designed with an intuitive user interface in mind; nevertheless, installation should be straightforward.<\/p>\n
Once downloaded and extracted, ensure you meet any pre-requirements such as Java eight on your local machine before continuing with setup.<\/p>\n
Installing Solar is simple; all that’s required to get up and running is downloading its binary distribution zip or tar file and extracting it.<\/p>\n
![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2025\/03\/Query-Management-in-Solr.jpg\")
<\/p>\n
Before doing this, however, please ensure you meet any pre-requisites (for instance Java 8) on your local machine before extracting.<\/p>\n
Solar’s success depends on a number of variables, including field copying volume and destination field counts as well as available disk space.<\/p>\n
By understanding these parameters and setting them appropriately for use on local machines, Solr can become more cost effective to operate efficiently.<\/p>\n
<\/span>Key Components of Solr and Its Configuration<\/strong><\/span><\/h2>\nSolr runs as a web application in Jetty web server on port 8983 using Java Virtual Machine (JVM).<\/p>\n
Solr organizes data using cores and collections; cores refer to physical indexes while collections refer to indexes distributed over multiple servers in a clustered setup.<\/p>\n
A Solr home directory may host several cores each stored separately within its directory structure.<\/p>\n
Every core requires its own configuration set, consisting of either managed-schema or schema.xml files as well as solrconfig.xml that regulates index structure and core behaviour. Solr ships with two preconfigured sets for quick setup.<\/p>\n
Indexing Structure and Configuration, Solr Allows Users to Efficiently Manage Search and Data Retrieval With its indexing structure and configuration, users are able to optimize search and data retrieval efficiently.<\/p>\n
<\/span>Optimizing Search with Solr Request Handlers<\/strong><\/span><\/h2>\nSolr’s request handlers handle incoming queries; with “select” being utilized specifically to retrieve documents.<\/p>\n
Queries can be created easily using an intuitive syntax, with Q as its core parameter to specify search terms and relevancy ranking; further refinement may occur through filter query parameters which narrow results by including only documents which meet specific criteria.<\/p>\n
Utilizing request handlers and query parameters effectively, users can improve search precision and efficiency in Solr.<\/p>\n
<\/span>User Interaction and Query Management in Solr<\/strong><\/span><\/h2>\nSolr provides an automated search feature by default; however, users can explicitly configure its use if desired.<\/p>\n
Without an associated catch-all field set aside for searching purposes, queries will fall back onto one or more specific fields when conducting their queries.<\/p>\n
![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2025\/03\/REPLICATION-APCHE-SOLR.jpg\")
<\/p>\n
Solr supports numerous response formats, such as JSON, CSV and XML formats – as well as those specific to programming languages like Python – for effortless data parsing.<\/p>\n
Furthermore, user-friendly interfaces enable developers and administrators to send queries without manually crafting HTTP requests.<\/p>\n
Real world applications often utilize search bars in user interfaces as gateways into Solr services via HTTP requests, while tools like Postman can enhance testing and customization to facilitate better integration and functionality.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.9.7″ _module_preset=”default” background_color=”#064399″ use_background_color_gradient=”on” background_color_gradient_start=”#ff8c7c” background_color_gradient_end=”#e5ba4e” background_color_gradient_type=”radial” background_color_gradient_direction_radial=”top left” background_color_gradient_start_position=”35%” background_color_gradient_end_position=”80%” transform_scale=”74%|69%” transform_scale_linked=”off” transform_translate=”-53px|-50px” transform_translate_linked=”off” custom_margin=”||-5px||false|false” custom_padding=”|||2px|false|false” link_option_url=”https:\/\/cloudfoundation.com\/blog\/” link_option_url_new_window=”on”][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/06\/8423118_3895895.png” _builder_version=”4.9.7″ _module_preset=”default” width=”85.4%” custom_margin=”-31px||-24px||false|false” custom_padding=”|22px|0px||false|false”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ _module_preset=”default” text_font=”Georgia|700|||||||” text_font_size=”23px” text_line_height=”1.3em” header_font=”Georgia|700|||||||” header_font_size=”19px” header_letter_spacing=”-1px” header_line_height=”1.2em” transform_scale=”171%|159%” transform_scale_linked=”off” transform_translate=”40px|44px” transform_translate_linked=”off” transform_origin=”70%|50%” z_index=”-161″ width=”100%” custom_margin=”|-215px||||” custom_padding=”|0px||||” link_option_url=”https:\/\/cloudfoundation.com\/blog\/” link_option_url_new_window=”on”]<\/p>\n
Apache Solr<\/strong> Online Training<\/span><\/h1>\n[\/et_pb_text][et_pb_button button_url=”https:\/\/cloudfoundation.com\/blog\/” url_new_window=”on” button_text=”Up Coming Batches” _builder_version=”4.9.7″ _module_preset=”default” custom_button=”on” button_text_color=”#E09900″ button_bg_color=”#FFFFFF” button_font=”|700|||||||” transform_translate=”64px|65px” transform_translate_linked=”off” background_layout=”dark”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2019\/06\/logo_resize_color.png” _builder_version=”4.9.7″ _module_preset=”default” transform_translate=”-36px|0px” transform_translate_linked=”off” custom_margin=”|||178px||”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.7″ background_size=”initial” background_position=”top_left” background_repeat=”repeat”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.9.7″ text_font=”Georgia||||||||” text_text_color=”#000000″ text_font_size=”22px” text_line_height=”1.9em” max_width=”800px” max_width_last_edited=”off|phone” custom_margin=”|||10%” custom_margin_last_edited=”off|desktop” text_font_size_tablet=”” text_font_size_phone=”” text_font_size_last_edited=”on|phone” text_line_height_last_edited=”off|phone”]<\/p>\n
<\/span>Utilizing Dynamic Fields in Solr for Flexible Data Handling<\/strong><\/span><\/h2>\nWithin Solr itself are Dynamic Fields to offer flexible data handling capabilities; utilize Dynamic Fields in Solr to Meet Flexible Data Handling Needs<\/p>\n
Dynamic fields enable applications to accommodate newly introduced data sources or fields without altering their schema.xml files.<\/p>\n
They’re especially effective during indexing processes as they allow seamless incorporation of new types such as social media fields without altering structural design.<\/p>\n
Dynamic fields make indexing simpler but they may present difficulties when querying.<\/p>\n
![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2025\/03\/DATA-BASE-ARCHITECTURE-IN-APACHE-SOLR.jpg\")
<\/p>\n
Queries relating to dynamically indexed fields require explicitly listing their fields or using suffix patterns like wildcards in queries; to search multiple fields users must add either dynamic or static field names into their queries.<\/p>\n
Implementation of dynamic fields requires thoughtful consideration as their implementation increases flexibility, but does not inherently enhance query capabilities.<\/p>\n
With proper configuration in place, dynamic fields ensure efficient data indexing and retrieval while maintaining search accuracy.<\/p>\n
<\/span>Evolution and Advancements in Solr<\/strong><\/span><\/h2>\nSolr Has Undergone Substantial Advancements Solr has seen dramatic advances, moving from early versions with limited capabilities to its latest iteration 4.0 that provides more advanced and scalable platform features.<\/p>\n
Now featuring full-text search, web scalability and elastic scaling capabilities to provide optimal conditions in dynamic web environments, it is also designed for efficient scaling with interoperability features as well as administrative configuration options to meet dynamic environments efficiently. Ultimately it provides full text searching functionality.<\/p>\n
<\/span>Solr Architecture and Its Components<\/strong><\/span><\/h2>\nSolr offers developers powerful tools for optimizing application performance and streamlining search functionalities with its enhanced search capabilities and scalable architecture, such as its enhanced search features and scalable architecture.<\/p>\n
Here is more on Solr Architecture and Components<\/p>\n
Solr architecture was designed for efficient management, configuration, monitoring and scaling capabilities.<\/p>\n
![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2025\/03\/HANDLING-DATA-FIELDS-IN-APCHE-SOLR.jpg\")
<\/p>\n
An administrative web app provides users with simple system administration capabilities allowing them to configure settings quickly while monitoring system performance.<\/p>\n
Solr servers run on Java-compatible web containers such as Tomcat or Jetty that facilitate application development.<\/p>\n
These web containers manage HTTP\/RESTful requests through request handlers that efficiently process them before intercepting services to satisfy them efficiently.<\/p>\n
Service handlers in this system come preconfigured to manage various forms of requests and ensure smooth scalability and operation – helping developers integrate applications while keeping system stability.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.9.7″ _module_preset=”default” background_color=”#064399″ use_background_color_gradient=”on” background_color_gradient_start=”#494fff” background_color_gradient_end=”#9ea6ff” background_color_gradient_type=”radial” background_color_gradient_direction_radial=”top left” background_color_gradient_start_position=”35%” background_color_gradient_end_position=”80%” transform_scale=”74%|71%” transform_scale_linked=”off” transform_translate=”-53px|-50px” transform_translate_linked=”off” link_option_url=”https:\/\/cloudfoundation.com\/blog\/” link_option_url_new_window=”on”][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/06\/Untitled-11.png” title_text=”Untitled-11″ _builder_version=”4.9.7″ _module_preset=”default” transform_scale=”103%|103%” transform_scale_linked=”off” transform_translate=”11px|0px” transform_translate_linked=”off” custom_padding=”|88px||||”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ _module_preset=”default” text_font=”Georgia|700|||||||” text_text_color=”#FFFFFF” text_font_size=”23px” text_line_height=”1.3em” header_font=”Georgia|700|||||||” header_font_size=”19px” header_letter_spacing=”-1px” header_line_height=”1.2em” transform_scale=”171%|159%” transform_scale_linked=”off” transform_translate=”40px|44px” transform_translate_linked=”off” transform_origin=”70%|50%” z_index=”-161″ width=”100%” custom_margin=”|-215px||||” custom_padding=”|0px||||” link_option_url=”https:\/\/cloudfoundation.com\/blog\/” link_option_url_new_window=”on”]<\/p>\n
Apache Solr Course Price<\/strong><\/span><\/h1>\n[\/et_pb_text][et_pb_button button_url=”https:\/\/cloudfoundation.com\/” url_new_window=”on” button_text=”Offer Price” _builder_version=”4.9.7″ _module_preset=”default” custom_button=”on” button_text_color=”#0C71C3″ button_bg_color=”#FFFFFF” button_font=”|700|||||||” transform_translate=”64px|65px” transform_translate_linked=”off”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2019\/06\/logo_resize_color.png” title_text=”logo_resize_color” _builder_version=”4.9.7″ _module_preset=”default” transform_translate=”-36px|0px” transform_translate_linked=”off” custom_margin=”|||178px||”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.7″ background_size=”initial” background_position=”top_left” background_repeat=”repeat”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_team_member name=”Vanitha” position=”Author” image_url=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2024\/09\/Vanitha.png” _builder_version=”4.9.7″ header_level=”h5″ header_font=”Titillium Web|700|||||||” body_font=”Titillium Web||||||||” body_font_size=”16″]The capacity to learn is a gift; the ability to learn is a skill; the willingness to learn is a choice[\/et_pb_team_member][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"
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What is Apache Solr? - CloudFoundation | Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cloudfoundation.com\/blog\/what-is-apache-solr\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Apache Solr? - CloudFoundation | Blog\" \/>\n<meta property=\"og:description\" content=\"[et_pb_section fb_built=”1″ _builder_version=”4.9.7″][et_pb_row _builder_version=”4.9.7″ background_size=”initial” background_position=”top_left” background_repeat=”repeat”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_post_title meta=”off” featured_image=”off” _builder_version=”4.9.7″ title_font=”Times New Roman||||||||” title_text_align=”left” title_text_color=”#000000″ title_font_size=”47″ background_color=”RGBA(0,0,0,0)” background_enable_image=”off” custom_margin=”|||10%” title_font_size_tablet=”40″ title_font_size_phone=”35″ title_font_size_last_edited=”on|desktop”][\/et_pb_post_title][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.7″ background_size=”initial” background_position=”top_left” background_repeat=”repeat”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.9.7″ text_font=”Georgia||||||||” text_text_color=”#000000″ text_font_size=”22px” text_line_height=”1.9em” max_width=”800px” max_width_last_edited=”off|phone” custom_margin=”|||10%” custom_margin_last_edited=”off|desktop” hover_enabled=”0″ text_font_size_tablet=”” text_font_size_phone=”” text_font_size_last_edited=”on|phone” text_line_height_last_edited=”off|phone” sticky_enabled=”0″] What is Apache Solr? 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