[EsAggs] Improve agg performance setting track_total_hits to false

[dej611]

Describe the feature:

Any aggregation only search request’s (size=0) performance can be improved by setting ‘track_total_hits’ to ‘false’.
This was also confirmed by ES team.
It would be nice to find all those opportunities on our side to leverage it for speed-ups.

@thomasneirynck reported that Maps is already using this.
From my first investigation Lens is simply relying on the default of the esAggs code, which should be true.

Tasks:

• investigate those aggs who require a precise total hits value
• add some logic to detect whether it's possible to disable the flag
• measure the speed-ups?
  • perhaps add it to the performance journey job?

[elasticmachine]

Pinging @elastic/kibana-visualizations @elastic/kibana-visualizations-external (Team:Visualizations)