Introduction to SOLR Search Engine

Solr is an open source search platform which can index and search multiple sites by returning suggestions for related content based on the search query. Solr makes it easy for programmers to develop sophisticated, high-performance search applications with advanced features such as faceting (arranging search results in columns with numerical counts of key terms). Solr builds on another open source search technology: Lucene, built on Java. It provides indexing then search technology, as well as spell checking, advanced analysis/tokenization and hit highlighting capabilities
A Solr index can accept data from many different sources, including comma-separated value (CSV) files, XML files, files in common file formats such as Microsoft Word or PDF and data extracted from tables in a database.
How does SOLR search work? 

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