ElasticV{6,7}QueryChangesTest: Add comment about issue 10120

Add a comment to clarify that the index close operation is done
to prevent issue 10120.

Change-Id: Id8d5b4e922674404351ac9a5a7a281283485fdb1
2 files changed
tree: c0612b075b62cd8541cf4b04e9e8571d82dc3a9c
  1. java/
  2. javatests/