[Star Tree] [Search] Nested Aggregations

[sandeshkr419]

Is your feature request related to a problem? Please describe

The following aggregations are already supported/in-flight which can be resolved via star-tree:

• Numeric terms
• Keyword terms
• Date histograms
• Range aggregations
• Metric aggregations

Right now, in these aggregations, the child aggregation is only restricted to metric aggregations. We can actually support nesting of the above aggregations as well with the existing framework.

Describe the solution you'd like

Benchmark the different nested aggregations to see performance improvements with the usage of star-tree resolution.

While setting up star-tree we do a very strict matching on query shapes right now. This should ideally be a recursive query matching to see valid query shapes which can be resolved via star-tree.

Related component

Search:Aggregations

Describe alternatives you've considered

No response

Additional context

No response