[Backport 2.x] Fix the bug that masterOperation(with task param) is bypassed #4114
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The method `protected void masterOperation(Task task, Request request, ClusterState state, ActionListener<Response> listener)` was not properly deprecated by the commit 2a1b239 / PR #403. There is a problem that it doesn't make any difference to whether overriding the method `void masterOperation(Task task, Request request, ClusterState state, ActionListener<Response> listener)` or not. The reason is the only usage for the method changed to call another method `clusterManagerOperation(task, request, clusterState, l)`, which is the default implementation for the method `masterOperation(with task param)`. There is no other usage for the method `masterOperation()` so it's bypassed. In the commit: - Change delegation model for method `clusterManagerOperation(with task param)` to call `masterOperation(with task param)`, according to the comment below #4103 (comment) - Add a test to validate the backwards compatibility, which copied and modified from an existing test. Signed-off-by: Tianli Feng <ftianli@amazon.com> (cherry picked from commit 3ab0d1f)
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Backport 3ab0d1f from #4103
There is a problem that it doesn't make any difference to whether overriding the method
void masterOperation(Task task, Request request, ClusterState state, ActionListener<Response> listener)or not.clusterManagerOperation(with task param)to callmasterOperation(with task param), according to the comment below Fix the bug that masterOperation(with task param) is bypassed #4103 (comment)