Fix get field mapping API returns 404 error in mixed cluster with multiple versions

[gaobinlong]

Description

Fix the bug of get field mapping API returns 404 error intermittently in a mix cluster with multiple versions(1.x and 2.x), the bug is cause by the deserialization method of GetFieldMappingsResponse in 2.x that doesn't handle the stream from 1.x node correctly, if the requested field doesn't exist in the index, then this line in 1.x node writes 0 to the out stream, but in 2.x branch and main branch, we don't take 0 into account, so an exception Expected single type but received [0] is thrown, finally the get field mapping api request returns 404 error.

After this PR is backported to 2.x branch, this flaky test will be resolved.

Related Issues

#13622
#2440

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[github-actions]

✅ Gradle check result for 404d1c1: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 71.64%. Comparing base (b15cb0c) to head (2464237).
Report is 273 commits behind head on main.

Files	Patch %	Lines
.../indices/mapping/get/GetFieldMappingsResponse.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13624      +/-   ##
============================================
+ Coverage     71.42%   71.64%   +0.22%     
- Complexity    59978    61117    +1139     
============================================
  Files          4985     5052      +67     
  Lines        282275   287146    +4871     
  Branches      40946    41608     +662     
============================================
+ Hits         201603   205730    +4127     
- Misses        63999    64382     +383     
- Partials      16673    17034     +361     

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[github-actions]

❌ Gradle check result for e3351c5: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[reta]

Thanks a lot @gaobinlong !

[github-actions]

❌ Gradle check result for 2464237: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[reta]

❌ Gradle check result for 2464237: FAILURE

#12197
#13600

[github-actions]

❌ Gradle check result for 2464237: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[reta]

❌ Gradle check result for 2464237: FAILURE

#13476

[github-actions]

❌ Gradle check result for 2464237: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[reta]

❌ Gradle check result for 2464237: FAILURE

java.lang.Exception: Suite timeout exceeded (>= 1200000 msec).
	at __randomizedtesting.SeedInfo.seed([4E67A13E835E2CB8]:0)

[github-actions]

✅ Gradle check result for 2464237: SUCCESS