Represents the non-key attribute names which will be projected into the index. For local secondary indexes, the total count of
            NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two
            different indexes, this counts as two distinct attributes when determining the total.
             
            
Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)Constraints:
 Declaration Syntax
 Declaration Syntax