CODEWITHSUNDEEP
elasticsearch
Komal
Komal

Reputation: 73

How does elasticsearch facet feature work with async search query?

I am aware of how using the facet feature of elasticsearch, we can get the aggregated value of values for a specified field/s based on search query result data.

I have an application where I am monitoring logs and using elasticsearch to search through the log entries. On UI front I have a paging mechanism in place and hence using async feature of the search to fetch 'n' entries at a time.

So my question is, if I modify my async search query to fetch the facet information for certain fields, will it give the aggregated value for the sub-set of result that is fetched as a result of an async query. or will it get the aggregated value for the entire search result (and not the sub-set which is returned to user).

Many thanks and regards, Komal

Upvotes: 1

Views: 393

Answers (2)

Jagdeep
Jagdeep

Reputation: 312

Please refer here for detail documentation. You can give match all query to fetch facet on all documents { "query" : { "match_all" : { } }, "facets" : { "tag" : { "terms" : { "field" : "tag", "size" : 10 } } } } Please post your code gist for more information.

Upvotes: 1

imotov
imotov

Reputation: 30163

Facets are returned for the entire search result. You can even set size to 0 in your request, which will result in not fetching any results and you will still get all facets.

Upvotes: 1

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