FrameDecoder and cumulation size

[Thibaut]

Sometimes we make concurrent larger requests (> 30 MB) through elasticsearch
and the buffers are still kept afterwards, even though we don't use them
anymore afterwards. This causes us to have more than 400 MB of allocated
buffers in our heap which we don't use.

It would be great if it would be possible to drop the allocated buffers
after they are not used for a while anymore. Or even reduce the buffer size
if the last 100 requests were more than of a factor of 2 smaller than the
largest request.




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