The new GSA version (7.0) allows for splitting up the values in metadata fields based on a seperator. In your case "|" seems to be the case.
That will instruct the GSA to index those values as separate field/values like FIELD_NAME=VAL1, FIELD_NAME=VAL2 etc.
From there on you can use these values in facets and/or fieldsearches with the requiresfields parameter.