Longer queries return a lot of search results

[vastevenson]

When users type in queries like "Italy was cool and nice", my search query returns nearly every document in my index. What are the best practices to improve precision of search results? I feel like the multi_match should clause with the fuzziness is the main culprit. Are there any recommendations on how to do fuzzy queries on select fields?

Here's my query body:

    "query": {
                    "bool": {
                        "must": [
                            {
                                "bool": {
                                    "should": [
                                        {
                                            "multi_match": {
                                                "query":self.query,
                                                "fuzziness": "AUTO"
                                            }
                                        },
                                        {
                                            "multi_match": {
                                                "query": self.query,
                                                "fields": [
                                                    "brief_summary^3",
                                                    "brief_title^3",
                                                    "mesh_term_list^3"
                                                ]
                                            }
                                        },
                                        {
                                            "match": {
                                                "id": self.query
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }