OpenSearch/docs/reference/migration/migrate_7_0/aggregations.asciidoc

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[[breaking_70_aggregations_changes]]
=== Aggregations changes
==== Deprecated `global_ordinals_hash` and `global_ordinals_low_cardinality` execution hints for terms aggregations have been removed
These `execution_hint` are removed and should be replaced by `global_ordinals`.
==== `search.max_buckets` in the cluster setting
The dynamic cluster setting named `search.max_buckets` now defaults
to 10,000 (instead of unlimited in the previous version).
Requests that try to return more than the limit will fail with an exception.
==== `missing` option of the `composite` aggregation has been removed
The `missing` option of the `composite` aggregation, deprecated in 6.x,
has been removed. `missing_bucket` should be used instead.
==== Replaced `params._agg` with `state` context variable in scripted metric aggregations
The object used to share aggregation state between the scripts in a Scripted Metric
Aggregation is now a variable called `state` available in the script context, rather than
being provided via the `params` object as `params._agg`.
The old `params._agg` variable is still available as well.