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d1b60269f4
When the ML annotations index was first added, only the ML UI wrote to it, so the code to create it was designed with this in mind. Now the ML backend also creates annotations, and those mappings can change between versions. In this change: 1. The code that runs on the master node to create the annotations index if it doesn't exist but another ML index does also now ensures the mappings are up-to-date. This is good enough for the ML UI's use of the annotations index, because the upgrade order rules say that the whole Elasticsearch cluster must be upgraded prior to Kibana, so the master node should be on the newer version before Kibana tries to write an annotation with the new fields. 2. We now also check whether the annotations index exists with the correct mappings before starting an autodetect process on a node. This is necessary because ML nodes can be upgraded before the master node, so could write an annotation with the new fields before the master node knows about the new fields. Backport of #61107