Werk #14829: Monitoring of Elasticsearch indices: Rework grouping of individual indices

Elasticsearch can be configured to automatically add a timestamp to index names, see the documentation. This results in index names such as my-index-2018.09.12, my-index-2018.09.13, my-index-2018.09.14 etc. In Checkmk, users will most likely not want to monitor such indices as individual services. Instead, users want to monitor a service called "my-index", which accumulates data accross the individual sub-indices.

Before this werk, Checkmk identified matching indices by cutting off index names after the first "-". This is far too restrictive. For example, the indices "customer-a" and "customer-b" were accumulated into one combined index called "customer", which is most likely unwanted. Also, this grouping was not configurable.

As of this werk, Checkmk no longer does any grouping by default. Instead, the grouping can now be configured via the discovery ruleset Discovery of Elasticsearch indices. See the help texts in the user interface for details regarding the configuration options.

This werk is marked as incompatible because it will result in changed service configurations (new and vanished services) if the index names contain "-". Using the new discovery ruleset, users can however reproduce the old behaviour before this werk. This can be achieved by grouping indices according to the regular expression [^-]+.

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