In this chapter, we covered rarely used but important techniques to optimize the performance of our Solr instance, learned more about how to get similar documents based on the rendered result set, what is the geospatial search (search documents with respect to a specific geographical point), how to search for words based on how they sound, and how to ignore the predefined words from getting searched.

In the next chapter, we will learn how to troubleshoot common problems that are not limited to dealing with corrupted and locked indexes, how to truncate the index size and tackle issues caused due to expensive garbage collections, out-of-memory, and infinite loop execution while playing around with shards.