Unable to commit volatile index ERRORs in a clustered JPP 6 setup on Windows

Issue

Running multiple clustered JPP 6.2.0 nodes on Windows 2012 is leading to an error on the first node, after the second node has come up.

Everything is fine until instance #2 has been started up, and that this instance is able to get the index data from the coordinator (node #1):

08:49:46,353 INFO  [exo.jcr.component.core.MultiIndex] (MSC service thread 1-4) Setting index OFFLINE (repository/repository_pc-system)
08:49:46,369 INFO  [exo.jcr.component.core.MultiIndex] (MSC service thread 1-4) Retrieving index from coordinator (repository/repository_pc-system)...
08:49:46,493 INFO  [exo.jcr.component.core.MultiIndex] (MSC service thread 1-4) Setting index ONLINE (repository/repository_pc-system)

We can see the corresponding activity logged on node #1:

08:49:46,369 INFO  [exo.jcr.component.core.MultiIndex] (Incoming-1,172.24.44.249:56201) Setting index OFFLINE (repository/repository_pc-system)
08:49:46,400 INFO  [exo.jcr.component.core.MultiIndex] (Incoming-1,172.24.44.249:56201) Setting index ONLINE (repository/repository_pc-system)

However, a few seconds later node #1 fails to write the new IndexInfo to the disk:

08:49:56,491 ERROR [exo.jcr.component.core.MultiIndex] (MultiIndex Flush Timer) Unable to commit volatile index: java.io.IOException: Cannot delete C:\tmp\TESTCLUSTER\1\jboss-portal-6.2\standalone\data\gatein\jcr\lucene\portal-system_portal\indexes
    at org.apache.lucene.store.FSDirectory.deleteFile(FSDirectory.java:296) [lucene-core-3.5.0.jar:3.5.0 1204988 - simon - 2011-11-22 14:46:51]
    at org.exoplatform.services.jcr.impl.core.query.lucene.IndexInfos$2.run(IndexInfos.java:197) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.commons.utils.SecurityHelper.doPrivilegedExceptionAction(SecurityHelper.java:310) [exo.kernel.commons-2.4.11-GA-redhat-1.jar:2.4.11-GA-redhat-1]
    at org.exoplatform.commons.utils.SecurityHelper.doPrivilegedIOExceptionAction(SecurityHelper.java:57) [exo.kernel.commons-2.4.11-GA-redhat-1.jar:2.4.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.IndexInfos.write(IndexInfos.java:166) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.MultiIndex$9.run(MultiIndex.java:1692) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.MultiIndex$9.run(MultiIndex.java:1662) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.commons.utils.SecurityHelper.doPrivilegedExceptionAction(SecurityHelper.java:310) [exo.kernel.commons-2.4.11-GA-redhat-1.jar:2.4.11-GA-redhat-1]
    at org.exoplatform.commons.utils.SecurityHelper.doPrivilegedIOExceptionAction(SecurityHelper.java:57) [exo.kernel.commons-2.4.11-GA-redhat-1.jar:2.4.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.MultiIndex.flush(MultiIndex.java:1661) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.MultiIndex.checkFlush(MultiIndex.java:2250) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.MultiIndex.access$2100(MultiIndex.java:107) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at org.exoplatform.services.jcr.impl.core.query.lucene.MultiIndex$10.run(MultiIndex.java:1798) [exo.jcr.component.core-1.15.11-GA-redhat-1.jar:1.15.11-GA-redhat-1]
    at java.util.TimerThread.mainLoop(Timer.java:555) [rt.jar:1.8.0_45]
    at java.util.TimerThread.run(Timer.java:505) [rt.jar:1.8.0_45]

The node is not able to recover from this error.