Updates hybrid search query to match against all_titles using the 'and' operator and the 'english' stopword analyzer

[bmquinn]

The new subquery that goes alongside the neural search query uses the AND operator and the english stopword analyzer:

{
  "match": {
    "all_titles":  {
      "query": config.question,
      "operator": "AND",
      "analyzer": "english"
    }
  }
}