OpenSearch Migration for SQL/PPL

[dai-chen]

Issue #, if available:

Description of changes: If nothing else miss, the only leftover is the ES doc links in source code comments and documentation. The Gradle build is failing because the secrets are not added to Github env yet

1.Changing to OpenSearch Dependencies

• build.gradle
  • Plugin version → 1.15.0
  • Add private Maven S3 repo -> 1.13.0.0-Snapshot
  • Replace all org.elasticsearch, ElasticsearchException
  • Organize imports to pass checkstyle

2.Renaming to OpenSearch

• Module names: elasticsearch
• Class names
  • ElasticsearchXXX
  • ESXXX
• Package names
  • ODFE [no changes]
  • xxx.sql.elasticsearch
• Source code
  • Elasticsearch in comments
  • ES, Es, es in variable/function name
  • ES doc link
• ANTLR
  • grammar
• Config files
  • plugin-descriptor.xml
  • plugin.config
  • elasticsearch.yml
• Test data
  • Explain JSON file
  • Test index name
• Documentation
  • README
  • User manual

3.Renaming to OpenSearch Dashboards

4.Testing

• Checkstyle
• Pass UT
• Pass IT
• Comparison test (Rerun after JDBC migrated)
• Doctest (Rerun after CLI migrated)
• GitHub action

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dblock]

Two more typo-s.

[joshuali925]

I also see some other ES/Elasticsearch under docs didn't change, are they in scope for renaming? If so you can try running something like rg -e '\bE[Ss]\b' -e '(?<!for|for-|for )Elasticsearch' --pcre2 -g 'docs/**' to get a list

[dai-chen]

I also see some other ES/Elasticsearch under docs didn't change, are they in scope for renaming? If so you can try running something like rg -e '\bE[Ss]\b' -e '(?<!for|for-|for )Elasticsearch' --pcre2 -g 'docs/**' to get a list

Thanks for the command. Double checked only ES-SQL and Elasticsearch proprietary remain on purpose.

[joshuali925]

LGTM