I implemented a filter for adult pages in a web search using a multi_match query like the following:
"query": "long nsfw word list",
I was hoping that this would be cacheable as the adult query never changes.
But currently it seems to have some overhead on queries (an intern query with 0 results is 10 ms without adult filter and 40 ms with adult filter, a normal user search with ca 500000 results is 100ms without and 250 with).
Can I somehow force elasticsearch to cache the results of this query?
Any other ideas on how to construct an adult filter with less overhead?
I can of course just calculate an adult flag at index time, which is the current plan but a lot less flexible than a cached query would be.
We currently use elasticsearch 2.4.1