The following is just a list of resources and notes related to optimizing Elasticsearch.
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Index Sorting and more and this
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Use preference to route related searches to the same shards, to try and take advantage of caches
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Experiment with execution hints, it can make a difference (even switching to
map, despite what the docs say about when to use it) -
Try adjusting shard_size if you’re using large
sizevalues. -
There may be a natural index sorting if there’s a natural partition field for your data (eg all your searches target a single username)
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You may be able to reduce the number of buckets being returned by using includes