[9.0] Change the handling of passthrough dimenensions (#127752) #127889
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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.
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Backport of #127752.
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 #125156.
To fix this we refine the check that determines if a field is dimension, to skip wrapper field.
Fixes #125156.