Memory leak like behaviour

Did anyone experience a "memory leak" like behaviour , even in Idle mode.
It seems that we forgot to bound something and ES is just eating all the
memory until it dies.

Here is a memory heap size screenshot from graphite :

https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGThis
is an heap size image from one of the our nodes ( all the other behave the
exact same way ). The cluster is most of the time in idle mode and does
not get any traffic. https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGThe
big downfall near to 12/05 12PM is where it died , so we had to restart it
again and it started to rise contantly . The somewhere near the end of the
graph we redirected traffic to the nodes so you see the spikes in the
memory.https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGSome
info on the data that is there.https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGES
version : 0.19.8 https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPG23
M documents indexed , that take 25GB of data. https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPG12
shards , 1 replicahttps://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGRuns
4 nodes on 4 x 48GB VM's https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGAll
the nodes behave the same.https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPG
https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPGThanks
for any helphttps://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPG
https://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPG
Romanhttps://lh6.googleusercontent.com/-U4-ruVTPi28/UMSX0RfgWdI/AAAAAAAALdc/qdpNq0y3x98/s1600/Capture.JPG

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