5a2ba34174
We discussed recently that the cluster state API should be considered "internal" and therefore our usual cast-iron stability guarantees do not hold for this API. However, there are a good number of REST tests that try to identify the master node. Today they call `GET /_cluster/state` API and extract the master node ID from the response. In fact many of these tests just want an arbitary node ID (or perhaps a data node ID) so an alternative is to call `GET _nodes` or `GET _nodes/data:true` and obtain a node ID from the keys of the `nodes` map in the response. This change adds the ability for YAML-based REST tests to extract an arbitrary key from a map so that they can obtain a node ID from the nodes info API instead of using the master node ID from the cluster state API. Relates #40047. |
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