Fix flakiness of testQueryFiltering due to error bound

[austintlee]

Description

This change addresses an inappropriate/incorrect error bound on TDigest estimates on medians used in MedianAbsoluteDeviationAggregatorTests. TDigest algorithm's error is proportional to q*(1-q) where q is the percentile and is at worst in the middle (median). 0.1 is more appropriate for 90 percentile (q = 0.9).

Issues Resolved

#4789

Check List

• New functionality includes testing.
  • [x ] All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• [ x] Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.common.util.concurrent.QueueResizableOpenSearchThreadPoolExecutorTests.classMethod
      1 org.opensearch.gateway.RecoveryFromGatewayIT.testReuseInFileBasedPeerRecovery
      1 org.opensearch.common.util.concurrent.QueueResizableOpenSearchThreadPoolExecutorTests.testResizeQueueDown
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

• URL: https://build.ci.opensearch.org/job/gradle-check/14618/
• CommitID: 6a2c09b
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #7317 (f6f6f32) into main (d984f50) will decrease coverage by 0.08%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##               main    #7317      +/-   ##
============================================
- Coverage     70.71%   70.64%   -0.08%     
+ Complexity    59497    59485      -12     
============================================
  Files          4859     4859              
  Lines        285339   285339              
  Branches      41133    41133              
============================================
- Hits         201772   201570     -202     
- Misses        66965    67181     +216     
+ Partials      16602    16588      -14     

see 473 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/14619/
• CommitID: f6f6f32

[dblock]

LGTM, but cc:ing @tdunning in case we get our math wrong 😅