Per request latency

[dzane17]

Draft

% curl -XGET 'localhost:9200/_search?pretty&phase_took' -H 'Content-Type: application/json' -d'
{
 "query": { "query_string": { "query": "value1" } }
}'
{
  "took" : 16,
  "phase_took" : {
    "dfs_pre_query" : 0,
    "query" : 13,
    "fetch" : 2,
    "dfs_query" : 0,
    "expand" : 0,
    "can_match" : 0
  },
  "timed_out" : false,
  "_shards" : {
    "total" : 10,
    "successful" : 10,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.2876821,
    "hits" : [
      {
        "_index" : "test2",
        "_id" : "1",
        "_score" : 0.2876821,
        "_source" : {
          "field1" : "value1"
        }
      }
    ]
  }
}