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?
https://www.elastic.co/guide/en/elasticsearch/guide/current/using-synonyms.html
https://www.elastic.co/guide/en/elasticsearch/guide/current/most-fields.html
Also tune via stemmers
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