Create PIT API

[bharath-techie]

Description

This PR contains Create PIT API changes.
Context:
A Point In Time is a set of segments which are frozen in time taken at the moment of creation. We lock the segments of those indices’ shards and create contexts to access and query only those shards.
The Create PIT API returns PIT Id which later can be used as part of search requests to get results on that view of data.

Issues Resolved

#1147

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

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[Bukhtawar]

@bharath-techie can we fix up the branch, the rebase seems to have screwed it up

[bharath-techie]

@bharath-techie can we fix up the branch, the rebase seems to have screwed it up

@Bukhtawar we need to change the base to feature/point_in_time branch before merge. It'll have a big diff as the diff will be against PIT changes + main.. i've changed it back to main , please change it to point in time feature branch before merge.

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[Bukhtawar]

@reta @andrross @kartg Are you folks good with this?

[andrross]

@Bukhtawar I see this is set to merge to the feature branch. What is the plan for getting this into main?

[reta]

@Bukhtawar I see this is set to merge to the feature branch. What is the plan for getting this into main?

The changeset is huge, could we rebase / merge feature branch with main first please? It is difficult to revisit the change, thanks!

[Bukhtawar]

@reta rebase is done
@andrross Yes we need to ensure we don't expose an API for a feature in development, the next few PRs should add the other set of APIs. In the interim we can explore putting this feature behind a feature flag and pushing to main

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