when the uid of METRIC, TAGK, TAGV are the same,the document which send to es ealier will be overrided by the lastest.

[lynnyuan-arch]

As follows:
uidmeta:
doc1. {"uid":"1", type:"METRIC", name:"sys.cpu.usage"}
doc2. {"uid":"1", type:"TAGK", name:"host.name"}
the document "doc1" will be overrided by "doc2"
source codes:

https://github.com/OpenTSDB/opentsdb-elasticsearch/blob/master/src/main/java/net/opentsdb/search/schemas/uidmeta/UIDMetaSchema.java

final StringBuilder uri = new StringBuilder(es.host())
.append("/")
.append(es.index())
.append("/")
.append(doc_type)
.append("/")
.append(meta.getUID());

so, i just add uid type(metric, tagk, tagv) before uid value。
as follows:

final StringBuilder uri = new StringBuilder(es.host())
.append("/")
.append(es.index())
.append("/")
.append(doc_type)
.append("/")
.append(meta.getType().name().toLowerCase()+meta.getUID());