[2017-03-20T10:12:24,559][ERROR][o.e.x.m.AgentService     ] [9OFRpS4] exception when exporting documents
org.elasticsearch.xpack.monitoring.exporter.ExportException: failed to flush export bulks
    at org.elasticsearch.xpack.monitoring.exporter.ExportBulk$Compound.doFlush(ExportBulk.java:148) ~[x-pack-5.2.2.jar:5.2.2]
    at org.elasticsearch.xpack.monitoring.exporter.ExportBulk.close(ExportBulk.java:77) ~[x-pack-5.2.2.jar:5.2.2]
    at org.elasticsearch.xpack.monitoring.exporter.Exporters.export(Exporters.java:183) ~[x-pack-5.2.2.jar:5.2.2]
    at org.elasticsearch.xpack.monitoring.AgentService$ExportingWorker.run(AgentService.java:196) [x-pack-5.2.2.jar:5.2.2]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: org.elasticsearch.xpack.monitoring.exporter.ExportException: failed to flush export bulk [default_local]
    at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.doFlush(LocalBulk.java:114) ~[?:?]
    at org.elasticsearch.xpack.monitoring.exporter.ExportBulk.flush(ExportBulk.java:62) ~[?:?]
    at org.elasticsearch.xpack.monitoring.exporter.ExportBulk$Compound.doFlush(ExportBulk.java:145) ~[?:?]
    ... 4 more
Caused by: org.elasticsearch.xpack.monitoring.exporter.ExportException: bulk [default_local] reports failures when exporting documents
    at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.throwExportException(LocalBulk.java:121) ~[?:?]
    at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.doFlush(LocalBulk.java:111) ~[?:?]
    at org.elasticsearch.xpack.monitoring.exporter.ExportBulk.flush(ExportBulk.java:62) ~[?:?]
    at org.elasticsearch.xpack.monitoring.exporter.ExportBulk$Compound.doFlush(ExportBulk.java:145) ~[?:?]
    ... 4 more