Does ES load field data when specifying fields in a query?

(None) #1

Just as the title asks...

I'm using doc_values where ever possible. But I have a query that specifies specific fields to return rather then the full source.

Are those fields loaded in fieldata cache?

(Mark Walkom) #2

It will, so that it can do the query on them. But as fas as I understand it won't load into fielddata cache, it'll just load them to read them and then eventually age out with GC.

(None) #3

Ok let me check closer, cause I switched to doc_values and I got field_data cache growing. I may have missed a field or it may be a non doc_value field

(Mark Walkom) #4

Unless you have everything as docvalues, wjhich can only be done on unanalysed fields, you will still get fielddata cache growth.

(system) #5