Fix a bug in significant_terms - #127975

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.

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.

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.

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.

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.

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.

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.

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.

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.

Co-authored-by: Nik Everett <nik9000@gmail.com>