[8.17] Add _metric_names_hash field to OTel metric mappings (#120952) #122882
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If metrics that have the same timestamp and dimensions aren't grouped into the same document, ES will consider them to be a duplicate. The _metric_names_hash field will be set by the OTel ES exporter. As it's mapped as a time_series_dimensions, it creates a different _tsid for documents with different sets of metrics. The tradeoff is that if the composition of the metrics grouping changes over time, a different _tsid will be created. That has an impact on the rate aggregation for counters.
felixbarny added :Data Management/Data streams 
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Backports the following commits to 8.17: