弹性搜索多个字段中的多个关键字

我正在尝试在弹性搜索中构建查询以在多个字段的文本内搜索,例如:标题和描述是字段,我想在这3个字段中搜索"obama","world","news".我tryed搜索和发现这里弹性网站信息:
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-multi-match-query.html#_literal_fields_literal_and_per_field_boosting 但问题是当我尝试这种结构时会产生错误:
首先:

{
  "multi_match" : {
    "query":      "obama world news",
    "type":       "cross_fields",
    "fields":     [ "Title", "Description" ],
    "operator":   "and"
  }
}

它会产生如下错误:

{
    "error": "SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][0]: SearchParseException[[republishan2][0]: from[-1],size[-1]: Parse Failure [Failed to parse source [    {\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n    }]]]; nested: SearchParseException[[republishan2][0]: from[-1],size[-1]: Parse Failure [No parser for element [multi_match]]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][3]: SearchParseException[[republishan2][3]: from[-1],size[-1]: Parse Failure [Failed to parse source [    {\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n    }]]]; nested: SearchParseException[[republishan2][3]: from[-1],size[-1]: Parse Failure [No parser for element [multi_match]]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][4]: SearchParseException[[republishan2][4]: from[-1],size[-1]: Parse Failure [Failed to parse source [    {\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n    }]]]; nested: SearchParseException[[republishan2][4]: from[-1],size[-1]: Parse Failure [No parser for element [multi_match]]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][1]: SearchParseException[[republishan2][1]: from[-1],size[-1]: Parse Failure [Failed to parse source [    {\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n    }]]]; nested: SearchParseException[[republishan2][1]: from[-1],size[-1]: Parse Failure [No parser for element [multi_match]]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][2]: SearchParseException[[republishan2][2]: from[-1],size[-1]: Parse Failure [Failed to parse source [    {\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n    }]]]; nested: SearchParseException[[republishan2][2]: from[-1],size[-1]: Parse Failure [No parser for element [multi_match]]]; }]",
    "status": 400
}

我也试过这个查询:

{
    "sort": {
        "re_max": {
            "order": "desc"
            }
            }, 
    "query": {
      "multi_match" : {
        "query":      "obama world news",
        "type":       "cross_fields",
        "fields":     [ "Title", "Description" ],
        "operator":   "and"
      }
    },
    "from": 0, 
    "size": 30}
}

这就是结果:

{
    "error": "SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][0]: SearchParseException[[republishan2][0]: from[-1],size[-1],sort[!]: Parse Failure [Failed to parse source [{\n\t\"sort\": {\n\t\t\"re_max\": {\n\t\t\t\"order\": \"desc\"\n\t\t\t}\n\t\t\t}, \n\t{\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n\t},\n\t\"from\": 0, \n\t\"size\": 30}\n}]]]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: [B@52afc562; line: 7, column: 3]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][3]: SearchParseException[[republishan2][3]: from[-1],size[-1],sort[!]: Parse Failure [Failed to parse source [{\n\t\"sort\": {\n\t\t\"re_max\": {\n\t\t\t\"order\": \"desc\"\n\t\t\t}\n\t\t\t}, \n\t{\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n\t},\n\t\"from\": 0, \n\t\"size\": 30}\n}]]]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: [B@52afc562; line: 7, column: 3]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][4]: SearchParseException[[republishan2][4]: from[-1],size[-1],sort[!]: Parse Failure [Failed to parse source [{\n\t\"sort\": {\n\t\t\"re_max\": {\n\t\t\t\"order\": \"desc\"\n\t\t\t}\n\t\t\t}, \n\t{\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n\t},\n\t\"from\": 0, \n\t\"size\": 30}\n}]]]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: [B@52afc562; line: 7, column: 3]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][1]: SearchParseException[[republishan2][1]: from[-1],size[-1],sort[!]: Parse Failure [Failed to parse source [{\n\t\"sort\": {\n\t\t\"re_max\": {\n\t\t\t\"order\": \"desc\"\n\t\t\t}\n\t\t\t}, \n\t{\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n\t},\n\t\"from\": 0, \n\t\"size\": 30}\n}]]]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: [B@52afc562; line: 7, column: 3]]; }{[0CTkBM0pQGK1MzYEDlrpcQ][republishan2][2]: SearchParseException[[republishan2][2]: from[-1],size[-1],sort[!]: Parse Failure [Failed to parse source [{\n\t\"sort\": {\n\t\t\"re_max\": {\n\t\t\t\"order\": \"desc\"\n\t\t\t}\n\t\t\t}, \n\t{\n      \"multi_match\" : {\n        \"query\":      \"obama world news\",\n        \"type\":       \"cross_fields\",\n        \"fields\":     [ \"Title\", \"Description\" ],\n        \"operator\":   \"and\"\n      }\n\t},\n\t\"from\": 0, \n\t\"size\": 30}\n}]]]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: [B@52afc562; line: 7, column: 3]]; }]",
    "status": 400
}

我正在使用Postman Rest客户端来运行查询.我的代码有什么问题？