For multiple postcodes, score should not depend of the postcode

[frodrigo]

When a municipality is with multiple postcodes in the input data, the search should match any postcode in the same way and the score should be the same.

It looks like only one postcode is indexed can be found with a good match.

Here Bordeaux have multiple postcodes, the main is 33000, but there is at least also 3800 or 33200.

Search just "Bordeaux", score 0.96 for "33800 Bordeaux"

/search/?type=municipality&q=bordeaux&limit=1

      "properties": {
        "label": "Bordeaux",
        "score": 0.9607690909090908,
        "id": "33063",
        "type": "municipality",
        "name": "Bordeaux",
        "postcode": "33800",
        "citycode": "33063",
        "x": 416627.63,
        "y": 6423408.37,
        "population": 259809,
        "city": "Bordeaux",
        "context": "33, Gironde, Nouvelle-Aquitaine",
        "importance": 0.56846,
        "municipality": "Bordeaux"
      }

Search for "33800 Bordeaux", score 0.96 for "33800 Bordeaux"

/search/?type=municipality&q=33800 bordeaux&limit=1

      "properties": {
        "label": "Bordeaux",
        "score": 0.9607690909090908,
        "id": "33063",
        "type": "municipality",
        "name": "Bordeaux",
        "postcode": "33800",
        "citycode": "33063",
        "x": 416627.63,
        "y": 6423408.37,
        "population": 259809,
        "city": "Bordeaux",
        "context": "33, Gironde, Nouvelle-Aquitaine",
        "importance": 0.56846,
        "municipality": "Bordeaux"
      }

Search for "33000 Bordeaux", score 0.65 for "33800 Bordeaux"

/search/?type=municipality&q=33000 bordeaux&limit=1

      "properties": {
        "label": "Bordeaux",
        "score": 0.6516781818181816,
        "id": "33063",
        "type": "municipality",
        "name": "Bordeaux",
        "postcode": "33800",
        "citycode": "33063",
        "x": 416627.63,
        "y": 6423408.37,
        "population": 259809,
        "city": "Bordeaux",
        "context": "33, Gironde, Nouvelle-Aquitaine",
        "importance": 0.56846,
        "municipality": "Bordeaux"
      }