java.lang.OutOfMemoryError: Java heap space on ES 6.4.0

Hi Everyone,

Host was getting down when performing indexing,
Cluster having 5 nodes in that three nodes going down ,When we restarted Es againcluster will be healthy and same issue will reflect if we do indexing on it.

Please find the below error what am facing here.

at$HeadContext.channelRead( ~[?:?]

at ~[?:?]

[2019-02-07T00:58:34,589][WARN ][o.e.x.s.t.n.SecurityNetty4ServerTransport] [] exception caught on transport layer [NettyTcpChannel{localAddress=/, remoteAddress=/}], closing connection

io.netty.handler.codec.DecoderException: java.lang.OutOfMemoryError: Java heap space

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