Routing to a group of shards (nodes)?

Is it possible to index/search documents within a group of shards ?
While indexing, if I provide the routing parameter, the document should be
indexed on a specific shard, but on which one? what happens if we continue
to index with the same routing param? the shard is always getting bigger?
Is it likely to configure routing for a group of shards and split the data
on multiple selective shards? or nodes ?

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