IndexProjectionMode type  
Defines values for IndexProjectionMode. 
KnownIndexProjectionMode can be used interchangeably with IndexProjectionMode,
this enum contains the known values that the service supports.
Known values supported by the service
skipIndexingParentDocuments: The source document will be skipped from writing into the indexer's target index. 
includeIndexingParentDocuments: The source document will be written into the indexer's target index. This is the default pattern.
type IndexProjectionMode = string