java StringIndexOutOfBoundsException: String index out of range: -1

gistfile1.txt

[2013-09-06 05:29:09,687][DEBUG][action.bulk              ] [Logstash] [logstash-2013.09.06][0] failed to execute bulk item (index) index {[logstash-2013.09.06][bind][vEFVp-m_QVSkeTBI_E0xUQ], source[{"@source":"file://xfr0//var/log/named","@tags":["xfr0_named"],"@fields":{},"@timestamp":"2013-09-06T09:33:47.215Z","@source_host":"xfr0","@source_path":"//var/log/named","@message":"client 10.0.10.14#55263 (spinn.net): transfer of 'spinn.net/IN': AXFR-style IXFR ended","@type":"bind","@fields.date":"Sep 6 03:01:09","@fields.host":"xfr0","@fields.service":"bind","@fields.message":"client 10.0.10.14#55263 (spinn.net): transfer of 'spinn.net/IN': AXFR-style IXFR ended"}]}
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
    at java.lang.String.<init>(String.java:225)
    at org.elasticsearch.index.analysis.NumericTokenizer.reset(NumericTokenizer.java:59)
    at org.elasticsearch.index.analysis.NumericTokenizer.reset(NumericTokenizer.java:54)
    at org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:97)
    at org.apache.lucene.index.DocFieldProcessor.processDocument(DocFieldProcessor.java:254)
    at org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:256)
    at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:376)
    at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1473)
    at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1148)
    at org.elasticsearch.index.engine.robin.RobinEngine.innerCreate(RobinEngine.java:466)
    at org.elasticsearch.index.engine.robin.RobinEngine.create(RobinEngine.java:361)
    at org.elasticsearch.index.shard.service.InternalIndexShard.create(InternalIndexShard.java:316)
    at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:163)
    at org.elasticsearch.action.support.replication.TransportShardReplicationOperationAction$AsyncShardOperationAction.performOnPrimary(TransportShardReplicationOperationAction.java:532)
    at org.elasticsearch.action.support.replication.TransportShardReplicationOperationAction$AsyncShardOperationAction$1.run(TransportShardReplicationOperationAction.java:430)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:636)