Solandra OutOfMemoryError: Java heap space with 12GB Heap Size

[suniluiit]

) java.lang.OutOfMemoryError: Java heap space
at org.apache.lucene.util.PriorityQueue.initialize(PriorityQueue.java:108)
at org.apache.solr.handler.component.ShardFieldSortedHitQueue.(ShardDoc.java:111)
at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:485)
at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:390)
at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:289)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1368)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356)
at solandra.SolandraDispatchFilter.execute(SolandraDispatchFilter.java:183)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252)
at solandra.SolandraDispatchFilter.doFilter(SolandraDispatchFilter.java:147)