Infinispan as Lucene directory provider has "No sub-file with id .fnm found" errors in distributed mode

I have been trying to use Infinispan as a Lucene directory provider under Hibernate Search. A single node writes to the index via JMS. A configuration that uses Infinispan in distributed mode seems to work under development, but under load results in an exception that looks like the following.

Caused by: java.io.IOException: No sub-file with id .fnm found (fileName=_3.cfs files: [.fdt, .fdx])
at org.apache.lucene.index.CompoundFileReader.openInput(CompoundFileReader.java:156)
at org.apache.lucene.index.CompoundFileReader.openInput(CompoundFileReader.java:145)
at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:74)
at org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:73)
at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:115)
at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:93)
at org.apache.lucene.index.DirectoryReader.<init>(DirectoryReader.java:235)
at org.apache.lucene.index.ReadOnlyDirectoryReader.<init>(ReadOnlyDirectoryReader.java:34)
at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:506)
at org.apache.lucene.index.DirectoryReader.access$000(DirectoryReader.java:45)
at org.apache.lucene.index.DirectoryReader$2.doBody(DirectoryReader.java:498)
at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:754)
at org.apache.lucene.index.DirectoryReader.doOpenNoWriter(DirectoryReader.java:493)
at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:450)
at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:391)
at org.apache.lucene.index.IndexReader.openIfChanged(IndexReader.java:497)
at org.apache.lucene.index.IndexReader.reopen(IndexReader.java:681)
at org.hibernate.search.indexes.impl.SharingBufferReaderProvider$PerDirectoryLatestReader.refreshAndGet(SharingBufferReaderProvider.java:227)
... 117 more