Chewy reset breaks with ignore_blank option

[bowenzhou222]

Expected behavior

chewy:parallel:reset should work properly with the ignore_blank option

Actual behavior

It breaks with the following error:

[{"type":"mapper_parsing_exception","reason":"unknown parameter [ignore_blank] on mapper [xxx] of type [xxx]"}]

Steps to reproduce the problem

Create a simple index with "ignore_blank" option for any field:

class UsersIndex < Chewy::Index
  index_scope User
  field :name, ignore_blank: true
end

When run bin/rake chewy:parallel:reset\[user\], the actual payload sent to ES api will contain the "ignore_blank" field which is not accepted by ES:

"mappings": {
    "properties": {
      "name": {
        "type": "text",
        "ignore_blank": true
      },
}

I tried the following monkey patch and it seems to fix the bug:

    module Chewy
      module Fields
        class Base
          def mappings_hash
            mapping =
                if children.present?
                  {(multi_field? ? :fields : :properties) => children.map(&:mappings_hash).inject(:merge)}
                else
                  {}
                end
            mapping.reverse_merge!(options.except(:ignore_blank)) # here I have to remove "ignore_blank" from "options"
            mapping.reverse_merge!(type: (children.present? ? 'object' : Chewy.default_field_type))

            {name => mapping}
          end
        end
      end
    end

Version Information

v7.2.0