Unmute CCSDuelIT_testTerminateAfter test

[drempapis]

I removed the "terminated_early" from the responseToMap(...); This is a best-effort, transport metadata, and removing it only affects the local comparison map, not the server response, and none of the tests assert on that flag. The intent of all the tests in the class is preserved. If we ever need to test terminated_early explicitly, that should be a separate, targeted test, not this CCS duel.

Closes 126085

[elasticsearchmachine]

Pinging @elastic/es-search-foundations (Team:Search Foundations)

[pawankartik-elastic]

Could you help me understand how its presence causes the test to fail and get muted?

[drempapis]

@pawankartik-elastic Please address the assertion error mentioned in the reported ticket. The failure occurs when terminated_early does not match.

java.lang.AssertionError: Comparing async_search minimizeRoundTrip vs. fanOut. Didn't match expected value. /terminated_early: the elements don't match: [true] != [false].
Full diff                      _clusters: 
                         details: 
                 my_remote_cluster: 
                             _shards: 
                                failed: same [0]
                               skipped: same [0]
                            successful: same [5]
                                 total: same [5]
                             indices: same [ccs_duel_index]
                              status: same [successful]
                           timed_out: same [false]
                                took: same [-1]
                          failed: same [0]
                         partial: same [0]
                         running: same [0]
                         skipped: same [0]
                      successful: same [1]
                           total: same [1]
     
[truncated]

[smalyshev]

We may want to backport it since the original issue is on 8.19

[drempapis]

Thank you both!

[elasticsearchmachine]

💚 Backport successful

Status	Branch	Result
✅	9.1

[smalyshev]

@drempapis 8.19 too?

[drempapis]

@smalyshev This issue was initially reported but not muted in the branch version 8.19.