URLSubmit["http://www.wolfram.com",
  HandlerFunctions -> <|"TaskFinished" -> Print|>]

Failure["URLSubmitFailure",
  Association[
    "MessageTemplate" :> MessageName[URLSubmit, "invak"],
    "MessageParameters" -> {
      Association["TaskFinished" -> Print]
    }
  ]
]

curl -XGET "http://elastic00.example.com:9200/test-index/_search" -H 'Content-Type: application/json' -d'
{
  "query": {
    "match": {
      "_id": "AWDd8gqhdJ9xvhUtDICa"
    }
  }
}'

RunProcess[{"curl",
   "-XGET", "http://elastic00.example.com:9200/test-index/_search",
   "-H", "Content-Type: application/json",
   "-d", "{"query":{"match":{"_id":"AWDd8gqhdJ9xvhUtDICa"}}}"
  }, "StandardOutput"]

req = HTTPRequest[
  URLBuild[<|
    "Scheme" -> "http",
    "Domain" -> "elastic00.example.com",
    "Port" -> 9200,
    "Path" -> {"test-index", "_search"}|>],
  <|
   "ContentType" -> "application/json",
   "Body" -> ExportString[{"query" -> {"match" -> {"_id" -> "AWDd8gqhdJ9xvhUtDICa"}}}, "JSON"]
   |>
  ]

URLRead[req]

Failure["InvalidLocation",
  Association[
    "MessageTemplate" -> "Specified request is invalid",
    "MessageParameters" -> Association[]]]