是否有人能够使用elasticsearch xpack sql和Spark?

使用PySpark我试图从elasticsearch读取数据。通常,我会将查询设置为行上的某个内容(请参见下面的查询),并将es.resource设置为索引,例如“my_index/doc”,这样我就可以将数据读入spark:

q ="""{
          "query": {
              "match_all": {}
          }  
      }"""

Py4JJavaError: An error occurred while calling 
z:org.apache.spark.api.python.PythonRDD.newAPIHadoopRDD.
: org.elasticsearch.hadoop.rest.EsHadoopInvalidRequest: 
org.elasticsearch.hadoop.rest.EsHadoopRemoteException: 
invalid_index_name_exception: Invalid index name [_xpack], must not start with '_'.
null

有没有人试过使用xpack或者知道如何从Elasticsearch hadoop插件执行Elasticsearch SQL查询?

q = """{"query": "select * from eg_flight limit 1"}"""

es_read_conf = {
    "es.nodes" : "192.168.1.71,192.168.1.72,192.168.1.73",
    "es.port" : "9200",
    "es.resource" :  "_xpack/sql",
    "es.query" : q
}

es_rdd = sc.newAPIHadoopRDD(
    inputFormatClass="org.elasticsearch.hadoop.mr.EsInputFormat",
    keyClass="org.apache.hadoop.io.NullWritable", 
    valueClass="org.elasticsearch.hadoop.mr.LinkedMapWritable", 
    conf=es_read_conf)