Error creating index

[kebeda]

First time install yields the following exception:
Error Creating Index
Reason:
Error Creating Index
this writer hit an OutOfMemoryError; cannot flush

Error Log shows:

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eclipse.buildId=4.5.0.I20150320-0800
java.version=1.8.0_31
java.vendor=Oracle Corporation
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product -keyring /Users/.../.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -product org.eclipse.epp.package.java.product -keyring /Users/.../.eclipse_keyring -showlocation

it.unibz.instasearch
Error
Tue Mar 31 15:02:40 CDT 2015
Lock obtain timed out: NativeFSLock@/Users/.../Documents/workspaces/mars64-M6-Pearson/.metadata/.plugins/it.unibz.instasearch/searchindex/write.lock

org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/Users/.../Documents/workspaces/mars64-M6-Pearson/.metadata/.plugins/it.unibz.instasearch/searchindex/write.lock
at org.apache.lucene.store.Lock.obtain(Lock.java:85)
at org.apache.lucene.index.IndexWriter.init(IndexWriter.java:1545)
at org.apache.lucene.index.IndexWriter.(IndexWriter.java:1074)
at it.unibz.instasearch.indexing.StorageIndexer.createIndexWriter(StorageIndexer.java:93)
at it.unibz.instasearch.indexing.WorkspaceIndexer.updateFile(WorkspaceIndexer.java:273)
at it.unibz.instasearch.jobs.IndexUpdateJob.runInWorkspace(IndexUpdateJob.java:190)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:39)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

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The workspace directory /.metadata/.plugins/it.unibz.instasearch/searchindex has about 81M of files in it.
Deleted this directory and restarted eclipse. Same result.
Restarted eclipse with "-Xmx1024m". Same result.
Please advise.