[8.17] Change the handling of passthrough dimenensions (#127752) (#127890) #127905
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…stic#127890) When downsampling an index that has a mapping with passthrough dimensions the downsampling process identifies the wrapper object as a dimension and it fails when it tried to retrieve the type. We did some prework to establish a shared framework in the internalClusterTest. For now it only includes setting up time series data stream helpers and a limited assertion helper for dimensions and metrics. This allows us to setup an internalClusterTest that captures this issue during downsampling in elastic#125156. To fix this we refine the check that determines if a field is dimension, to skip wrapper field. Fixes elastic#125156.
gmarouli
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Backports the following commits to 8.17: