The resource name of a
ProductSet to be searched
for similar images. Format is: projects/PROJECT_ID/location
s/LOC_ID/productSets/PRODUCT_SET_ID.
The filtering expression. This can be used to restrict search
results based on Product labels. We currently support an AND
of OR of key-value expressions, where each expression within
an OR must have the same key. An '=' should be used to connect
the key and value. For example, "(color = red OR color =
blue) AND brand = Google" is acceptable, but "(color = red OR
brand = Google)" is not acceptable. "color: red" is not
acceptable because it uses a ':' instead of an '='.
