Multiple match_phrase conditions with another bool in a single ElasticSearch query?

I am trying to conduct an Elasticsearch query that searched a text field ("body") and returns items that match at least one of two multi-word phrases I provide (ie: "stack overflow" OR "the stackoverflow"). I would also like the query to only provide results that occur after a given timestamp, with the results ordered by time.

My current solution is below. I believe the MUST is working correctly (gte a timestamp), but the BOOL + SHOULD with two match_phrases is not correct. I am getting the following error:

Unexpected character ('{' (code 123)): was expecting double-quote to start field name

Which I think is because I have two match_phrases in there?

This is the ES mapping and the details of the ES API I am using details are here.

{"query":
  {"bool":
    {"should":
      [{"match_phrase":
         {"body":"a+phrase"}
       },
       {"match_phrase":
         {"body":"another+phrase"}
       }
      ]
    },
  {"bool":
    {"must":
      [{"range":
        {"created_at:
          {"gte":"thispage"}
        }
       }
      ]}
     }
    },"size":10000,
      "sort":"created_at"
}

I think you were just missing a single " after created_at.

{
    "query": {
        "bool": {
            "must": [
                {
                    "range": {
                        "created_at": {
                            "gte": "1534004694"
                        }
                    }
                },
                {
                    "bool": {
                        "should": [
                            {
                                "match_phrase": {
                                    "body": "a+phrase"
                                }
                            },
                            {
                                "match_phrase": {
                                    "body": "another+phrase"
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "size": 10,
    "sort": "created_at"
}

Also, you are allowed to have both must and should as properties of a bool object, so this is also worth trying.

{
    "query": {
        "bool": {
            "must": {
                "range": {
                    "created_at": {
                        "gte": "1534004694"
                    }
                }
            },
            "should": [
                {
                    "match_phrase": {
                        "body": "a+phrase"
                    }
                },
                {
                    "match_phrase": {
                        "body": "another+phrase"
                    }
                }
            ]
        }
    },
    "size": 10,
    "sort": "created_at"
}

On a side note, Postman or any JSON formatter/validator would really help in determining where the error is.