Add session attribute branch, or disable search restriction which refers session.branch attribute if it is not required. Or check why branch session attribute is not set.

In searchQuery, we can add Raw Filter Query as well. So I have set the query in addFilterRawQuery method.For Single valuesearchQuery.addFilterRawQuery("-color_string::red");For multiple valuessearchQuery.addFilterRawQuery("-color_string:(red white)")...