Aggregated index namespace matching main indices

Elasticsearch/Kibana/Fleet/Apm - 8.10.2.

Issue Description:
I am using the reroute processor to change namespaces according to the "labels.project" label. However, aggregated indices remain in the default namespace.

Feature Request:
I propose either considering this behavior as a potential bug or adding a feature that allows for the automatic relocation of aggregated indices to the same namespaces as their corresponding main indices when using the reroute processor. This enhancement would streamline the management of indices and improve overall data organization within the Elasticsearch ecosystem.