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java.lang.IllegalStateException: open at org.bson.util.Assertions.isTrue( at com.mongodb.DBTCPConnector.isMongosConnection( at com.mongodb.Mongo.isMongosConnection( at com.mongodb.DBCursor._check( at com.mongodb.DBCursor._hasNext( at com.mongodb.DBCursor.hasNext( at com.mongodb.DBCollection.getIndexInfo(