[8.19] Unlink delegate in ReleasableBytesReference once ref count reaches 0 (#127058) #127749
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…lastic#127058) We have some spots where we retain a reference to the `ReleasableBytesReference` instance well beyond its ref-count reaching `0`. If it itself references Netty buffers or `BigArrays` that are not pooled (mostly as a result of overflowing the pooled number of bytes for large messages or under heavy load) then those bytes are not GC-able unless we unlink them here.
original-brownbear
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:Distributed Coordination/Network
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Backports the following commits to 8.19: