下图中ElasticSearch的索引名称是?

"_index":"logstash-2020.01.17",

"_type":"doc",

"_id":"3sDqsm8Bu-kTpMz0jqhL",

"_score":1.0,

"_source":{

"@version"："1",

"message":"hadooplogstashhbasejava"

"host"："ddcvc",

"@timestamp":"2020-01-17T09：51：53.596Z"

}

}

A.ddcvc

B.logstash-2020.01.17(正确答案)

C.3sDqsm8Bu-kTpMz0jqhL

D.doc