[BUG] Inconsistent usage of POST vs. PUT

[dblock]

What is the bug?

Plugin uses PUT to start replication, but POST to pause, resume and stop. Seems inconsistent.

POST /_plugins/_replication/{index}/_pause
POST /_plugins/_replication/{index}/_resume
PUT /_plugins/_replication/{index}/_start
POST /_plugins/_replication/{index}/_stop

What is the expected behavior?

All these APIs should be either PUT or POST. Feels like POST.

[dblock]

[Catch All Triage - 1, 2, 3, 4, 5, 6]

[soosinha]

PUT method is used to create or update the resource. Here PUT is used for start replication as it "creates" the replication tasks and adds the replication metadata in the replication system index.