"geohash_precision" in mapping throws error when using format like "1km"

[tstibbs]

The doc (http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/mapping-geo-point-type.html#_mapping_options) says you can specify the precision using strings like "1km" or "1m".

However, doing so returns an error, only specifying the precision using a number seems to be allowed.

E.g., create a new index like this:

curl -XPUT 'http://localhost:9200/test' -d '{
  "mappings": {
    "pin": {
      "properties": {
        "location": {
          "type": "geo_point",
          "geohash_precision": "1m"
        }
      }
    }
  }
}'

and you'll get an error like this:

{
  "error" : "MapperParsingException[mapping [pin]]; nested: NumberFormatException[For input string: \"1m\"]; ",
  "status" : 400
}

I'm using 1.0.0.

[spinscale]

just checked the source, we only parse integers there at the moment... should be relatively simple to fix from my birds eye view.