java.lang.NoClassDefFoundError: com/carrotsearch/hppc/IntSet

Hi.Recently i try to use ES 2.4.4.But i am getting an Exception when i try to connect java client.I have no idea to solve this.Maven dependencies? I need your help.Thanks.
Exception: java.lang.NoClassDefFoundError: com/carrotsearch/hppc/IntSet

Perhaps i need to restart es cluster. I just restart my cluster ,and then try to execute java client. I did not see the same exception,

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