Aggs and constant_keyword

[nik9000]

Description

It'd be lovely is a filters or filter agg that touches a constant_keyword would properly rewrite itself to match_all and match_none and "go fast", at least when it's at the root of the aggs tree. Theoretically it should "just work" but it doesn't seem to. Also! The terms agg should be able to act on there being only a single possible value. Maybe it can even act on the match_all/match_none nature of the constant_keyword. I'm not sure how, but it does feel like there are optimizations in there. Particularly when terms is the top level agg.

[elasticsearchmachine]

Pinging @elastic/es-analytics-geo (Team:Analytics)

[nik9000]

We should also have a look at filters when the constant_keyword is deep in a bool query inside the filter. It should get rewritten and then merged into a simpler query.

[AkisPanagiotopoulos]

Hello @nik9000 , can i take this issue as a first time contributor?

[utkarsh-shrivastav77]

Hi is this issue still open

[afn7081]

Can i take this up if its still open?

[kkrik-es]

This issue is fairly involved and has some weird interactions with other ongoing efforts in aggregations. We prefer to keep this assigned as is, hope to make progress in the coming weeks.

[atript8]

@kkrik-es please remove the good first issue tag then.