Tuning Elastic Relevance with synonyms

Tuning via bigrams (multi word matching)

Good for Tuning search results (can improve relevance by associating words together)

E.g. If a user searched for a long string, it would match based of bigrams in the shingles index

https://www.elastic.co/guide/en/elasticsearch/guide/current/shingles.html?

Tuning via synonyms (done via a token filter)

https://www.elastic.co/guide/en/elasticsearch/guide/current/using-synonyms.html

Word Suggestions

http://codeslashslashcomment.com/2012/09/01/search-query-suggestions-using-elasticsearch-via-shingle-filter-and-facets/

https://www.elastic.co/guide/en/elasticsearch/guide/current/most-fields.html

Also tune via stemmers