Ability to specify field type

[verglor]

It would be great if it was possible to explicitly specify elasticsearch type for the field.
Something like this:

class Domain {

    OffsetDateTime date

    static searchable = {
        date converter: OffsetDateTimeConverter, type: 'date'
    }

}

[verglor]

Actually looking at ElasticSearchMappingFactory#L197 I have found out that if converter is string representing elasticsearch type, it is interpreted as type. Like this:

class Domain {

    OffsetDateTime date

    static searchable = {
        date converter: 'date'
    }

}

This is undocumented and quite confusing.

[paulbarker]

+1. I have an 'Address' domain with the 'country' property as a String which gets mapped as 'text'. So the only way I can get aggregations on Elastic is by changing it to an enum to get the 'keyword' type.
Lots of changes to my code (arguably for the better but still...)