index-management
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[FEATURE] support aggregation of _size in rollup
_size is added via mapper-size plugin
From UI, unable to select _size field to add to metrics rollup.
If created from API to aggregate _size, the mapper validation logic will fail here https://github.com/opensearch-project/index-management/blob/main/src/main/kotlin/org/opensearch/indexmanagement/util/IndexUtils.kt#L180-L188
We should support aggregation of _size in rollup
Can I be assigned to this task please?