こんなエラーが発生。

/var/log/elasticsearch/docker.elasticsearch.log

[2016-05-10 22:03:25,166][DEBUG][action.bulk              ] [node1] [machibbs][0] failed to execute bulk item (index) index {[machibbs][hokkaidou][AVScsjPnl8T62om8oCpW], source[{ "idx": 410, "mail":"mailto:sage", "name":"なまら名無し", "date":"2016/05/09(月) 09:28:37", "id":"HV3Ce5Bw ", "provider":"KD182250248040.au-net.ne.jp", "URL":"1458894419", "body":"<dd> 08:00   スッキリ！！　★放送時間拡大！午前１０時２５分までお送りします★ <br><br>"}]}
MapperParsingException[failed to parse [body]]; nested: JsonParseException[Illegal unquoted character ((CTRL-CHAR, code 9)): has to be escaped using backslash to be included in string value
 at [Source: org.elasticsearch.common.io.stream.InputStreamStreamInput@6edeb11c; line: 1, column: 206]];
    at org.elasticsearch.index.mapper.FieldMapper.parse(FieldMapper.java:329)
    at org.elasticsearch.index.mapper.DocumentParser.parseObjectOrField(DocumentParser.java:309)
    at org.elasticsearch.index.mapper.DocumentParser.parseValue(DocumentParser.java:436)
    at org.elasticsearch.index.mapper.DocumentParser.parseObject(DocumentParser.java:262)
    at org.elasticsearch.index.mapper.DocumentParser.parseDocument(DocumentParser.java:122)
    at org.elasticsearch.index.mapper.DocumentMapper.parse(DocumentMapper.java:309)
    at org.elasticsearch.index.shard.IndexShard.prepareCreate(IndexShard.java:529)
    at org.elasticsearch.index.shard.IndexShard.prepareCreateOnPrimary(IndexShard.java:506)
    at org.elasticsearch.action.index.TransportIndexAction.prepareIndexOperationOnPrimary(TransportIndexAction.java:215)
    at org.elasticsearch.action.index.TransportIndexAction.executeIndexRequestOnPrimary(TransportIndexAction.java:224)
    at org.elasticsearch.action.bulk.TransportShardBulkAction.shardIndexOperation(TransportShardBulkAction.java:326)
    at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:119)
    at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:68)
    at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryPhase.doRun(TransportReplicationAction.java:639)
    at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
    at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryOperationTransportHandler.messageReceived(TransportReplicationAction.java:279)
    at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryOperationTransportHandler.messageReceived(TransportReplicationAction.java:271)
    at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:75)
    at org.elasticsearch.transport.TransportService$4.doRun(TransportService.java:376)
    at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.fasterxml.jackson.core.JsonParseException: Illegal unquoted character ((CTRL-CHAR, code 9)): has to be escaped using backslash to be included in string value
 at [Source: org.elasticsearch.common.io.stream.InputStreamStreamInput@6edeb11c; line: 1, column: 206]
    at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1581)
    at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:533)
    at com.fasterxml.jackson.core.base.ParserMinimalBase._throwUnquotedSpace(ParserMinimalBase.java:497)
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishString2(UTF8StreamJsonParser.java:2482)
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishAndReturnString(UTF8StreamJsonParser.java:2411)
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.getText(UTF8StreamJsonParser.java:285)
    at org.elasticsearch.common.xcontent.json.JsonXContentParser.text(JsonXContentParser.java:84)
    at org.elasticsearch.common.xcontent.support.AbstractXContentParser.textOrNull(AbstractXContentParser.java:194)
    at org.elasticsearch.index.mapper.core.StringFieldMapper.parseCreateFieldForString(StringFieldMapper.java:368)
    at org.elasticsearch.index.mapper.core.StringFieldMapper.parseCreateField(StringFieldMapper.java:311)
    at org.elasticsearch.index.mapper.FieldMapper.parse(FieldMapper.java:321)
    ... 22 more

Tabをエスケープできていないのか orz
エスケープしなきゃいけない文字一覧を調べたのでメモ。
https://www.ipentec.com/document/document.aspx?page=json-character-escape