SearchParseException: Failed to parse source [_na_]

We're getting the following exception in our logs, which is taking down the
whole cluster. We don't think we've changed any code recently on our side,
but the error has recently started showing up.

We're still investigating if this is a query we're building, or something
else. But, it doesn't correlate with anything on our side yet.

This is with version: 1.3.2

Help??

[2014-09-10 18:24:04,387][DEBUG][action.search.type ] [i-3276901e]
[intelligence_v1][118], node[NNDfAL3sS8GoLynod1mU8w], [P], s[STARTED]:
Failed to execute [org.elasticsearch.action.search.SearchRequest@4f9438d5]
lastShard [true]
org.elasticsearch.transport.RemoteTransportException:
[i-cd99ee9e][inet[/10.0.2.33:9300]][search/phase/query]
Caused by: org.elasticsearch.search.SearchParseException:
[intelligence_v1][118]: from[-1],size[-1]: Parse Failure [Failed to parse
source [na]]
at
org.elasticsearch.search.SearchService.parseSource(SearchService.java:664)
at
org.elasticsearch.search.SearchService.createContext(SearchService.java:515)
at
org.elasticsearch.search.SearchService.createAndPutContext(SearchService.java:487)
at
org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:256)
at
org.elasticsearch.search.action.SearchServiceTransportAction$SearchQueryTransportHandler.messageReceived(SearchServiceTransportAction.java:688)
at
org.elasticsearch.search.action.SearchServiceTransportAction$SearchQueryTransportHandler.messageReceived(SearchServiceTransportAction.java:677)
at
org.elasticsearch.transport.netty.MessageChannelHandler$RequestHandler.run(MessageChannelHandler.java:275)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.elasticsearch.ElasticsearchParseException: Failed to derive
xcontent from
org.elasticsearch.common.bytes.ChannelBufferBytesReference@7f9c402
at
org.elasticsearch.common.xcontent.XContentFactory.xContent(XContentFactory.java:259)
at
org.elasticsearch.search.SearchService.parseSource(SearchService.java:634)
... 9 more
[2014-09-10 18:24:04,385][DEBUG][action.search.type ] [i-3276901e]
[intelligence_v1][54], node[NNDfAL3sS8GoLynod1mU8w], [R], s[STARTED]:
Failed to execute [org.elasticsearch.action.search.SearchRequest@4f9438d5]
lastShard [true]

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