这个问题是由于ES的配置不正确导致的。如果您要将数据批量发送到ES，请确保在ES中正确配置了Bulk API的端点。

以下是一个处理批处理请求的基本示例：

// akka.http批处理请求示例
val bulkData = ByteString(
  """
    |{"index":{"_index":"myindex","_type":"mytype","_id":"1"}}
    |{"field":"value1"}
    |{"delete":{"_index":"myindex","_type":"mytype","_id":"2"}}
    |{"create":{"_index":"myindex","_type":"mytype","_id":"3"}}
    |{"field":"value3"}
    |{"update":{"_index":"myindex","_type":"mytype","_id":"4"}}
    |{"doc":{"field2":"value2"}}
  """.stripMargin)

val request = HttpRequest(
  method = HttpMethods.POST,
  uri = "https://localhost:9200/myindex/_bulk",
  entity = HttpEntity(ContentTypes.`application/json`, bulkData))

val responseFuture = Http().singleRequest(request)

responseFuture.flatMap { response =>
  response.entity.toStrict(2.seconds).map(_.data.utf8String)
}.foreach { responseBody =>
  println(s"Got response: $responseBody")
}

这是一个简单的用于将数据批量发送到ES的示例。请确保在请求ES时使用正确的端点，以避免出现以上错误。