[FEATURE] Set neural-search plugin 3.0.0 baseline JDK version to JDK-21

[reta]

Is your feature request related to a problem? Please describe

Set neural-search plugin 3.0.0 baseline JDK version to JDK-21

Describe the solution you'd like

See please opensearch-project/OpenSearch#10745

Related component

Build

Describe alternatives you've considered

N/A

Additional context

See please opensearch-project/OpenSearch#14011

[dblock]

[Catch All Triage - Attendees 1, 2, 3, 4, 5]

[martin-gaievski]

following PRs related to adding JDK21, they were done before/separately from this campaign:

#565
#801
#837
#801

[martin-gaievski]

@reta is there anything left for neural search plugin in scope of this campaign? We have done multiple small PRs that added jdk21 to different plugin areas, list is here #775 (comment).

[reta]

@reta is there anything left for neural search plugin in scope of this campaign? We have done multiple small PRs that added jdk21 to different plugin areas, list is here #775 (comment).

Yes, we need to update baseline here https://github.com/opensearch-project/neural-search/blob/main/build.gradle#L158

allprojects {
    ...
    targetCompatibility = JavaVersion.VERSION_21
    sourceCompatibility = JavaVersion.VERSION_21
    ...
}

Thanks @martin-gaievski