item property
A map of attribute name to attribute values, representing the primary key of
the item to be written by PutItem. All of the table's primary
key attributes must be specified, and their data types must match those of
the table's key schema. If any attributes are present in the item that are
part of an index key schema for the table, their types must match the index
key schema.
Implementation
final Map<String, AttributeValue> item;