Java heap space issue

Hello there!

All of a sudden today, one of the elastic nodes had come down due to the below issue,

What could be the possible value that I can bump it up to resolve this issue?

> [2017-06-26T13:00:47,081][TRACE][o.e.i.e.Engine           ] [] [search-sside][4] committing writer with translog id [29]  and sync id [null]
> [2017-06-26T13:00:47,081][TRACE][o.e.i.b.request          ] [request] Adjusted breaker by [-16440] bytes, now [32880]
> [2017-06-26T13:00:47,053][WARN ][o.e.x.s.t.n.SecurityNetty4Transport] [] exception caught on transport layer [[id: 0x7d5a964e, L:/ - R:/]], closing connection
> io.netty.handler.codec.DecoderException: java.lang.OutOfMemoryError: Java heap space
>         at io.netty.handler.codec.ByteToMessageDecoder.callDecode( ~[netty-codec-4.1.7.Final.jar:4.1.7.Final]
>         at io.netty.handler.codec.ByteToMessageDecoder.channelRead( ~[netty-codec-4.1.7.Final.jar:4.1.7.Final]

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