Relevance Search

query = {
    'query': {
        'bool': {
            'should': [
                {'match_phrase': {
                    'title_exact_match': {
                        'query': SENTINEL_BEGIN + ' ' + usersSearch + ' ' + SENTINEL_END,
                        'boost': 1000,
                    }          
                }},
                {
                   'function_score': {
                        'query': {
                            'constant_score': {
                                'filter': {
                                    'match_phrase': {
                                        'names_exact_match': SENTINEL_BEGIN + ' ' + usersSearch + ' ' + SENTINEL_END
                                    }
                                },
                                'boost': 1000.0
                            }            
                        },          
                        'functions': [
                        {
                             "gauss": {
                                "release_date": {
                                    "origin": "now",
                                    "scale": "5500d",
                                    "decay": 0.5
                                }
                            }
                        },
                        {
                            "field_value_factor": {
                             "field": "vote_average",
                             "modifier": "sqrt"
                            }
                        }
                        
                        ]
                    }                    
                },
                {'multi_match': {
                   'query': usersSearch,  #User's query
                    'fields': ['directors.name.bigramed','cast.name.bigramed'],
                    'type': 'cross_fields',
                    'boost': 100
                 }},
                {'multi_match': {
                   'query': usersSearch,  #User's query
                    'fields': ['overview', 'title', #C
                               'directors.name', 'cast.name'],
                    'type': 'cross_fields'                                
                 }},
                
            ]
        }
    },
    'size': 5,
    'explain': True
}

1 If the user’s query is a full, exact-title match, such as a search for “Star Trek Generations,” then that exact-title match should come straight to the top of the search results.
2 If the user’s query is a full, exact-name match, such as a search for “William Shatner,” then order results based on how recent and well rated the movie is.
3 Prioritize search results that include a person’s full name, such as the query “William Shatner Star Trek.”
4 Otherwise, base your scoring on a general text-based relevance of the user and a query.


■ SHOULD have full query exactly matching the title
■ SHOULD have full query, exactly matching a director’s or cast member’s full
name, scored by popularity and recency 
■ SHOULD have part of the query match a director’s or cast member’s full name
■ SHOULD have all the user’s query terms match somewhere in the document