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java.lang.NullPointerException: 	at java.util.TreeMap.getEntry(TreeMap.java:324)	at java.util.TreeMap.containsKey(TreeMap.java:209)	at java.util.TreeSet.contains(TreeSet.java:217)	at org.apache.manifoldcf.agents.output.elasticsearch.ElasticSearchSpecs.checkMimeType(ElasticSearchSpecs.java:164)	at org.apache.manifoldcf.agents.output.elasticsearch.ElasticSearchConnector.checkMimeTypeIndexable(ElasticSearchConnector.java:333)	at org.apache.manifoldcf.agents.incrementalingest.IncrementalIngester.checkMimeTypeIndexable(IncrementalIngester.java:212)	at org.apache.manifoldcf.crawler.system.WorkerThread$ProcessActivity.checkMimeTypeIndexable(WorkerThread.java:2091)	at org.apache.manifoldcf.crawler.connectors.DCTM.DCTM.processDocuments(DCTM.java:1811)	at org.apache.manifoldcf.crawler.connectors.BaseRepositoryConnector.processDocuments(BaseRepositoryConnector.java:423)	at org.apache.manifoldcf.crawler.system.WorkerThread.run(WorkerThread.java:556)