Elastic search giving OutOfMemory error

Hi,

I'm getting below exception while running elastic search using logstash . Please help on this.

[2014-02-28 11:24:29,280][DEBUG][action.search.type ] [Nut] [182865] Failed to execute fetch phase
org.elasticsearch.ElasticsearchException: Java heap space
at org.elasticsearch.ExceptionsHelper.convertToRuntime(ExceptionsHelper.java:37)
at org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:451)
at org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteFetch(SearchServiceTransportAction.java:406)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.executeFetch(TransportSearchQueryThenFetchAction.java:150)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction$2.run(TransportSearchQueryThenFetchAction.java:134)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.OutOfMemoryError: Java heap space
at org.apache.lucene.util.packed.PackedReaderIterator.(PackedReaderIterator.java:45)
at org.apache.lucene.util.packed.PackedInts.getReaderIteratorNoHeader(PackedInts.java:905)
at