ES 2.0.0 UTF-8 BOM failure on _bulk

gistfile1.txt

perl -e 'print "\xEF\xBB\xBF"' > test.dat
echo '{ "index" : { "_index" : "test", "_type" : "type1", "_id" : "1" } }' >> test.dat
echo '{ "field1" : "value1" }' >> test.dat

hexdump -C test.dat 
00000000  ef bb bf 7b 20 22 69 6e  64 65 78 22 20 3a 20 7b  |...{ "index" : {|
00000010  20 22 5f 69 6e 64 65 78  22 20 3a 20 22 74 65 73  | "_index" : "tes|
00000020  74 22 2c 20 22 5f 74 79  70 65 22 20 3a 20 22 74  |t", "_type" : "t|
00000030  79 70 65 31 22 2c 20 22  5f 69 64 22 20 3a 20 22  |ype1", "_id" : "|
00000040  31 22 20 7d 20 7d 0a 7b  20 22 66 69 65 6c 64 31  |1" } }.{ "field1|
00000050  22 20 3a 20 22 76 61 6c  75 65 31 22 20 7d 0a     |" : "value1" }.|
0000005f

[2015-11-02 17:20:49,328][INFO ][node                     ] [Earthquake] version[2.0.0], pid[77392], build[de54438/2015-10-22T08:09:48Z]

curl -XPOST '0:9200/_bulk' --data-binary @test.dat

fails with 

{"error":{"root_cause":[{"type":"parse_exception","reason":"Failed to derive xcontent"}],"type":"parse_exception","reason":"Failed to derive xcontent"},"status":400}

```
[2015-11-02 17:21:58,254][INFO ][rest.suppressed          ] /_bulk Params: {}
ElasticsearchParseException[Failed to derive xcontent]
	at org.elasticsearch.common.xcontent.XContentFactory.xContent(XContentFactory.java:293)
	at org.elasticsearch.action.bulk.BulkRequest.add(BulkRequest.java:251)
	at org.elasticsearch.rest.action.bulk.RestBulkAction.handleRequest(RestBulkAction.java:88)
	at org.elasticsearch.rest.BaseRestHandler.handleRequest(BaseRestHandler.java:54)
	at org.elasticsearch.rest.RestController.executeHandler(RestController.java:207)
	at org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:166)
	at org.elasticsearch.http.HttpServer.internalDispatchRequest(HttpServer.java:128)
	at org.elasticsearch.http.HttpServer$Dispatcher.dispatchRequest(HttpServer.java:86)
	at org.elasticsearch.http.netty.NettyHttpServerTransport.dispatchRequest(NettyHttpServerTransport.java:348)
	at org.elasticsearch.http.netty.HttpRequestHandler.messageReceived(HttpRequestHandler.java:63)
	at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
	at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
	at org.elasticsearch.http.netty.pipelining.HttpPipeliningHandler.messageReceived(HttpPipeliningHandler.java:60)
	at org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
	at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
	at org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:145)
	at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
	at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
	at org.jboss.netty.handler.codec.http.HttpContentDecoder.messageReceived(HttpContentDecoder.java:108)
	at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
	at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
	at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:459)
	at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:536)
	at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435)
	at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
	at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
	at org.elasticsearch.common.netty.OpenChannelsHandler.handleUpstream(OpenChannelsHandler.java:75)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
	at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
	at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
```