The Execution Scope SearchDoc, means the document in ElasticSearch (similar to a database table) that carries information of an item which is optimized for the usage in the Picturepark search. This includes information set to "include in search". The SearchDoc is optimized in several ways, including saving nested and hierarchical information in a flat structure (this means that value 1 doesn't know that it is the mother of value 2, this allows for faster searching).