Is it possible to index attributes conditionally ?

[Emilie-thp]

I'm new to ElasticSearch so I don't know if my question is relevant.
Given the following mappings, is it possible to index an attribute in a nested field only if a condition is matched..?

    settings do
      mappings dynamic: 'false' do
        indexes	:id, type: :keyword
        indexes :areas, type: 'nested' do
          indexes :id, type: :keyword
          indexes :area_type, type: :keyword
          indexes :zone, type: :geo_shape // => NEED A CONDITION HERE : index zone geo_shape only if the area has a specific area_type 
        end
      end
    end

My zone method for the geo_shape definition, in Area model looks like this :

  def zone
    { type: 'polygon',
      coordinates: [get_coordinates] }
  end

but my problem is that all areas do NOT need a geo_shape indexing. I want to index geo_shape only for area with a specific area_type.
If indexing is absolutely necessary for all attributes, I was thinking of indexing an empty geo_shape instead of a polygon (but I don't manage to do this).

Your help would be much appreciated on this point,

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