How to monitor Lucene inner ES

I am working with ES 2.4.1 and ES 6.4.0. When I start ES, I can monitor the process of ES instance using some profiler tools (actually, ES instance is an Java service). I can control the XMX and XMS of ES instance.
But, in some case, my ES instance was destroy (maybe the reason was Out Of Memory). But I didn't know actually the reason was. The XMX is very smaller than RAM capability. The only reason I concern is how much the memory the Lucene was used.
Is there any way to monitor Lucene inner ES?

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