[Backport 2.x] Fix automatic addition of protocol in discovery endpoint

[opensearch-trigger-bot]

Backport 2b1c9ae from #11612.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 6ad9a62

Incompatible components

Incompatible components: [https://github.com/opensearch-project/security-analytics.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/alerting.git]

[github-actions]

❕ Gradle check result for 6ad9a62: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteStoreStatsIT.testNonZeroPrimaryStatsOnNewlyCreatedIndexWithZeroDocs
      1 org.opensearch.remotestore.RemoteStoreStatsIT.testDownloadStatsCorrectnessSinglePrimaryMultipleReplicaShards
      1 org.opensearch.remotestore.RemoteIndexPrimaryRelocationIT.testPrimaryRelocationWhileIndexing

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cb3b0f3) 71.12% compared to head (6ad9a62) 70.99%.
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11634      +/-   ##
============================================
- Coverage     71.12%   70.99%   -0.14%     
+ Complexity    59293    59242      -51     
============================================
  Files          4883     4883              
  Lines        279308   279308              
  Branches      40934    40934              
============================================
- Hits         198655   198286     -369     
- Misses        63780    64238     +458     
+ Partials      16873    16784      -89     

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