trailing slash in keyword query breaks the internet

[nonword]

This causes a query_shard_exception:

q=mexico y sus alrededores/

It should not. We should either escape it or pass it to ES in a different way.

This is the ES query generated currently:

{
  "from": 0,
  "size": 50,
  "query": {
    "function_score": {
      "query": {
        "bool": {
          "should": [
            {
              "query_string": {
                "fields": [
                  "title^10",
                  "title.folded^5",
                  "description^5",
                  "subjectLiteral^5",
                  "creatorLiteral^5",
                  "contributorLiteral",
                  "note",
                  "shelfMark"
                ],
                "query": "mexico y sus alrededores/",
                "default_operator": "AND"
              }
            }
          ]
        }
      }
    }
  },
  "min_score": 0.65,
  "sort": [
    "_score"
  ]
}