fixing product Elastic Search indexing

few mistakes:
  * Product was excluding :id as an indexed attribute
  * MarketingProduct was using the same index as Product
      These are very different entities, so lets store
      them apart
  * rake reindex would import all Products (even Marketing product)
      as a product, So treat subclasses separately
  * As a result of treating subclasses separately, TaskStatus, and System
      subclasses need to be indexed as well
  * During investigation of task status, found issue with the 'result'
      field causing indexing to fail due to vastly different values
      (sometimes a bool, sometimes a hash), so dont index 'result'
Merge pull request #2810 from jlsherrill/fix_product_indexing

fixing product Elastic Search indexing