refactor(elasticsearch): use _index as greptimedb table in log ingestion and add /${index}/_bulk API

[zyy17]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

1. Take _index from bulk requests as greptimedb table;
2. Add ${index}/_bulk API;
3. Add LogIngestRequest and refactor ingest_logs_inner to support ingest logs into multiple tables by one request;

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

[codecov]

Codecov Report

Attention: Patch coverage is 92.60870% with 17 lines in your changes missing coverage. Please review.

Project coverage is 83.90%. Comparing base (24ea9cf) to head (9bb3277).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5335      +/-   ##
==========================================
- Coverage   84.13%   83.90%   -0.23%     
==========================================
  Files        1181     1181              
  Lines      220931   221090     +159     
==========================================
- Hits       185889   185515     -374     
- Misses      35042    35575     +533     

[shuiyisong]

LGTM

By the way, we may also want to accept table names specified in the HTTP header. Since we have all kinds of protocols using each of their own table naming methods, we can build a common extraction function to provide Greptime header parameters at the bottom and layered protocol-specified parameters at the top, much like our layered configuration structure.