Type of a data store.
Determines how search is performed in the data store.
Values:
DATA_STORE_TYPE_UNSPECIFIED (0):
Not specified. This value indicates that the
data store type is not specified, so it will not
be used during search.
PUBLIC_WEB (1):
A data store that contains public web
content.
UNSTRUCTURED (2):
A data store that contains unstructured
private data.
STRUCTURED (3):
A data store that contains structured data
(for example FAQ).