[DOC] Update search profile API documentation with concurrency related changes

[ticheng-aws]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request and all versions that are affected.
As a part of introducing concurrent segment search we have also updated the search profile API to return more detailed summary stats in cases with concurrency.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/OpenSearch#7355
opensearch-project/OpenSearch#7898

[ticheng-aws]

Hi @hdhalter, we are targeting this for 2.9 as well.

[ticheng-aws]

Hi @hdhalter and @kolchfa-aws, apologies for the confusion. The documentation change will be required for concurrent search GA (targeted v2.10) instead of v2.9.

[kolchfa-aws]

Thanks for the clarification, @ticheng-aws!

[sohami]

Another PR which will require profile related doc update: (opensearch-project/OpenSearch#8331)

[kolchfa-aws]

2.10 changes tracked in #4989

[kolchfa-aws]

@sohami Is there any documentation needed for the 2.11 version for this issue?

[kolchfa-aws]

Per offline sync with @sohami, there's no work to be done for 2.11 for this issue

[sohami]

Confirming we don't need any change in 2.11 for this API doc

[ticheng-aws]

We need to update the document for the query profile part here in the next release. We will have some new fields similar to the aggregation profile like max/min/avg_slice_time_in_nanos and time/count stats for the query breakdowns except create_weight type. More details can be found #9248.