Values:
UPDATE_TYPE_UNSPECIFIED (0):
Defaults to full replace behavior, ie. FULL_REPLACE.
UPDATE_TYPE_REPLACE (1):
Fully replace all the fields (including
previously linked raw document). Any field masks
will be ignored.
UPDATE_TYPE_MERGE (2):
Merge the fields into the existing entities.
UPDATE_TYPE_INSERT_PROPERTIES_BY_NAMES (3):
Inserts the properties by names.
UPDATE_TYPE_REPLACE_PROPERTIES_BY_NAMES (4):
Replace the properties by names.
UPDATE_TYPE_DELETE_PROPERTIES_BY_NAMES (5):
Delete the properties by names.
UPDATE_TYPE_MERGE_AND_REPLACE_OR_INSERT_PROPERTIES_BY_NAMES (6):
For each of the property, replaces the
property if the it exists, otherwise inserts a
new property. And for the rest of the fields,
merge them based on update mask and merge fields
options.
