Stack overflow in 5.6.2 after migration from 2.4.1

Hello

I am migrating an ELK stack from 2.4.1 to 5.6.2

I have installed ES 5.6.2 and restored from a snapshot

I have installed Kibana 5.6.2 and did a little bit of clicking around -very quickly, elasticsearch crashed with a stack overflow

log is below- how do i address this?

[2017-10-12T16:09:51,725][INFO ][o.e.c.m.MetaDataMappingService] [ykkVtRI] [.kibana/gRvKfH_ORv6Zp9HcSHT1rQ] create_mapping [_default_]
[2017-10-12T16:09:51,817][INFO ][o.e.c.m.MetaDataMappingService] [ykkVtRI] [.kibana/gRvKfH_ORv6Zp9HcSHT1rQ] create_mapping [url]
[2017-10-12T16:09:51,872][INFO ][o.e.c.m.MetaDataMappingService] [ykkVtRI] [.kibana/gRvKfH_ORv6Zp9HcSHT1rQ] create_mapping [server]
[2017-10-12T16:09:51,917][INFO ][o.e.c.m.MetaDataMappingService] [ykkVtRI] [.kibana/gRvKfH_ORv6Zp9HcSHT1rQ] create_mapping [timelion-sheet]
[2017-10-12T16:14:28,990][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [] fatal error in thread [elasticsearch[ykkVtRI][search][T#30]], exiting
java.lang.StackOverflowError: null
	at org.elasticsearch.cluster.routing.PlainShardsIterator.remaining(PlainShardsIterator.java:50) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.successfulShardExecution(InitialSearchPhase.java:196) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.skipShard(InitialSearchPhase.java:323) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.skipShard(AbstractSearchAsyncAction.java:321) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.maybeExecuteNext(InitialSearchPhase.java:147) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.successfulShardExecution(InitialSearchPhase.java:207) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.skipShard(InitialSearchPhase.java:323) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.skipShard(AbstractSearchAsyncAction.java:321) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.maybeExecuteNext(InitialSearchPhase.java:147) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.successfulShardExecution(InitialSearchPhase.java:207) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.skipShard(InitialSearchPhase.java:323) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.skipShard(AbstractSearchAsyncAction.java:321) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.maybeExecuteNext(InitialSearchPhase.java:147) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.successfulShardExecution(InitialSearchPhase.java:207) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.skipShard(InitialSearchPhase.java:323) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.skipShard(AbstractSearchAsyncAction.java:321) ~[elasticsearch-5.6.2.jar:5.6.2]

	[... snipped hundreds of identical lines ...]
	
	at org.elasticsearch.action.search.InitialSearchPhase.successfulShardExecution(InitialSearchPhase.java:207) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.skipShard(InitialSearchPhase.java:323) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.skipShard(AbstractSearchAsyncAction.java:321) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.maybeExecuteNext(InitialSearchPhase.java:147) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.successfulShardExecution(InitialSearchPhase.java:207) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.InitialSearchPhase.skipShard(InitialSearchPhase.java:323) ~[elasticsearch-5.6.2.jar:5.6.2]
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.skipShard(AbstractSearchAsyncAction.java:321) ~[elasticsearch-5.6.2.jar:5.6.2]

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