[8.19] Fix a bug in significant_terms (#127975) #127990
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Fix a bug in the `significant_terms` agg where the "subsetSize" array is too small because we never collect the ordinal for the agg "above" it. This mostly hits when the you do a `range` agg containing a `significant_terms` AND you only collect the first few ranges. `range` isn't particularly popular, but `date_histogram` is super popular and it rewrites into a `range` pretty commonly - so that's likely what's really hitting this - a `date_histogram` followed by a `significant_text` where the matches are all early in the date range held by the shard.
nik9000 added :Analytics/Aggregations 
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Backports the following commits to 8.19: