Fix last changed date after dynamic bulk index

[sathyapulse]

Description

The commit ecfb7bddc877d2326659cf8d03dcf3ddfb7faa55 changed the bulk index method from bulk_index to bulk_index_dynamically. The method triggers a different hook called ep_after_bulk_index_dynamically after the bulk index.

The last changed date was not updated after the bulk index because of the hook change. This commit adds the
ep_after_bulk_index_dynamically hook to update the last changed date so that it fetches the latest document from ES after it is indexed.

Changelog Description

Added

Removed

Fixed

Changed

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally or in Codespaces (or has an appropriate fallback).
• This change works and has been tested on a sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

Steps to Test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.53%. Comparing base (cb8e520) to head (b94a7d7).
Report is 22 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #6015      +/-   ##
=============================================
+ Coverage      30.51%   30.53%   +0.02%     
  Complexity      4811     4811              
=============================================
  Files            289      289              
  Lines          21173    21163      -10     
=============================================
+ Hits            6461     6463       +2     
+ Misses         14712    14700      -12     

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