WIP: Release transport messages incrementally while reading them #127435
+187
−58
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Code is still WIP but not too much work left actually.
That said ... even in this form the solution essentially up to halves the heap used for
handling large bulk shard requests on non-coordinating data nodes (this is
just one example, there's a couple spots where this saves a lot of memory).
Also, this could be extended to be a little smarter around compression easily, allowing
for potential order of magnitude savings around indexing if we lazy deserialize
individual docs or play similar tricks.