address fallback queries containing a unit no

When providing a unit number, the address fallback query does not fallback to match the correct housenumber+street even when that address is available (examples below).

The error is only triggered in the case where a unit no is provided and is clear when using debug mode to inspect the elasticsearch query, this could likely be solved by adding an additional fallback step for queries containing a unit number.

/v1/search?text=15/5-7 Esplanade, Elizabeth Bay, NSW, Australia

      "parsed_text": {
        "number": "5-7",
        "street": "esplanade",
        "neighbourhood": "elizabeth bay",
        "state": "nsw",
        "country": "australia",
        "unit": "15"
      }

# returns street

/v1/search?text=5-7 Esplanade, Elizabeth Bay, NSW, Australia

      "parsed_text": {
        "number": "5-7",
        "street": "esplanade",
        "neighbourhood": "elizabeth bay",
        "state": "nsw",
        "country": "australia"
      }
    },

# returns address

Start with the /v1/search endpoint and reproduce the two example queries in debug mode. Compare the Elasticsearch queries for the unit-number and housenumber+street cases, then verify that the unit-number query falls back to the correct address when it is available.