[Backport 2.x] Set analyzer to regex query string search

[opensearch-trigger-bot]

Backport ea4cfcc from #3967

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1747/
• CommitID: d7b8abf

[nknize]

manual intervention needed

[AmiStrn]

the weird thing is that @yyyogev signed all his commits with his personal email address. but when the merge commit was performed by maintainers the email was changed somehow to his work email. this is unfortunate.
I asked @yyyogev to open backports for this.

@nknize - what logic get's the email for the commit to main?

[nknize]

what logic get's the email for the commit to main?

The first commit was signed off using his work email address. For the final commit message I manually deleted all of the cruft leading up to that first commit message that concisely describes the change (no need to dirty the final commit log with all of the squashed commit messages like "small change"). Since that first message was signed off w/ the work email address it made the final message. I've had these issues before as well (e.g., my gmail vs apache email address). The reason it does this is because of the way the DCO sign-off validates the email address, it's not smart enough to check all of the email addresses verified on a contributor's github profile. It's a PITA, honestly, and should be improved.

I can fix DCO here shortly (unless another maintainer wants to take care of it).

[AmiStrn]

thanks, @nknize for the clear explanation. I missed that first commit somehow.

[nknize]

Apologies.. this dropped off my plate. Rebased, updated changelog, and fixed DCO sign-off.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/4536/
• CommitID: d675e6b

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/4537/
• CommitID: e6d6205

[codecov-commenter]

Codecov Report

Merging #4219 (e6d6205) into 2.x (a90fd73) will increase coverage by 0.03%.
The diff coverage is 65.40%.

@@             Coverage Diff              @@
##                2.x    #4219      +/-   ##
============================================
+ Coverage     70.62%   70.65%   +0.03%     
- Complexity    57126    57453     +327     
============================================
  Files          4585     4615      +30     
  Lines        274526   275873    +1347     
  Branches      40233    40366     +133     
============================================
+ Hits         193876   194920    +1044     
- Misses        64403    64675     +272     
- Partials      16247    16278      +31     

Impacted Files	Coverage Δ
...main/java/org/opensearch/gradle/PublishPlugin.java	43.43% <0.00%> (-0.45%)	⬇️
...ava/org/opensearch/client/RestHighLevelClient.java	41.75% <0.00%> (-2.27%)	⬇️
...er/src/main/java/org/opensearch/client/Client.java	40.00% <ø> (ø)
.../org/opensearch/client/support/AbstractClient.java	34.25% <0.00%> (-0.45%)	⬇️
...main/java/org/opensearch/common/lucene/Lucene.java	68.57% <ø> (+2.76%)	⬆️
...rg/opensearch/common/settings/ClusterSettings.java	91.89% <ø> (ø)
...pensearch/common/settings/IndexScopedSettings.java	100.00% <ø> (ø)
...index/codec/PerFieldMappingPostingFormatCodec.java	64.28% <ø> (ø)
...rg/opensearch/index/engine/TranslogLeafReader.java	40.90% <ø> (ø)
...java/org/opensearch/index/get/ShardGetService.java	60.89% <ø> (ø)
... and 556 more

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