3.7.1.2.6 OpaqueTextAnalyzerText fields can optionally be assigned the OpaqueTextAnalyzer. This causes the corresponding field values to be indexed as a single, opaque, down-cased value instead of as a series of terms. For example, if the text field UserDomain is assigned the OpaqueTextAnalyzer, the field value “NT AUTHORITY” will only match exact value searches for “nt authority”, “NT authority”, etc., but not term clauses for NT or authority.