[Tiered Caching][Milestone 1] Integrating IndicesRequestCache with tiered cache

[sgup432]

Is your feature request related to a problem? Please describe

As part of this issue, we need to integrate IndicesRequest with tiered cache via feature flag. A particular cache store name can be assigned to IndicesRequestCache via setting like below:

indices.request.cache.store.name: opensearch_onheap
indices.request.cache.opensearch_onheap.size: 100kb

We have already introduced changes for different kind of caches exposed via plugin. This change does to integrate all these pieces together.

Describe the solution you'd like

Integrating IndicesRequestCache with CacheService in case tiered feature flag is enabled. A desired cache object can be obtained via CacheService via settings.

Related component

Search:Performance

Describe alternatives you've considered

No response

Additional context

No response

[peternied]

[Triage - attendees 1 2 3 4 5]
@sgup432 Thanks for filing this issue, while there does seem to be enough context to evaulate this issue, its unclear what this issue is related to, it seems like there is a meta issue and its unclear how this issue is tied to that effort - could you add more details to the description?