Test: predefine sort fields in mapping, otherwise during the test the field may not be found if it were to be introduced dynamically at index time.
[Docs] Fix missing new line
[Docs] Fix missing comma in mapping
[Docs] fix consistency between examples
[TEST] Reduce possible number of indices in the test - 10 indices can create tons of shards
MLT Query: Fix exclude with artificial documents

Artificial documents get assigned a random id. When include is set to false
(default), the ids of these documents also get included, when they should
rather be ignored.

Closes #8679
Revert "MLT Query: Fix exclude with artificial documents"

This reverts commit 4c26cebf024c06e8536406f7c980c8d2f2783289.
MLT Query: Fix exclude with artificial documents

Artificial documents get assigned a random id. When include is set to false
(default), the ids of these documents also get included, when they should
rather be ignored.

Closes #8679
[TEST] Use different index on each iteration to ensure less timeout prone tests
[TEST] Add an assert for null indices in InternalEngineIntegrationTest
Test: add trace logging to RelocationTests

also improved error message when failing to delete a dummy doc
[TEST] remove outdated TestLogging annotation