Search: Defaults Enterprise Search to ElasticPress 4.2.2

[rebeccahum]

Description

⚠️ https://github.com/Automattic/vip-go-mu-plugins/pull/4606 needs to be merged first!!! ⚠️

This updates the elasticpress submodule to the same reference that elasticpress-next has. Also removes should_load_new_ep() since everyone should be on it now.

define( 'VIP_SEARCH_USE_NEXT_EP', false ); will no longer work after this, as we'll only be running one version of ElasticPress. I've kept the elasticpress-next submodule in this PR for now to ensure that there is no outside reference to it.

Changelog Description

Plugin Updated: Enterprise Search

Disable using define( 'VIP_SEARCH_USE_NEXT_EP', false );. There will only be one version of ElasticPress.

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 has an appropriate fallback).
• [ ] This change works and has been tested on a Go 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

1. define( 'VIP_SEARCH_USE_NEXT_EP', false ); and ensure that ElasticPress is 4.2.2