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* [Transform] add support for terms agg in transforms (#56696) This adds support for `terms` and `rare_terms` aggs in transforms. The default behavior is that the results are collapsed in the following manner: `<AGG_NAME>.<BUCKET_NAME>.<SUBAGGS...>...` Or if no sub aggs exist `<AGG_NAME>.<BUCKET_NAME>.<_doc_count>` The mapping is also defined as `flattened` by default. This is to avoid field explosion while still providing (limited) search and aggregation capabilities.