CBLQueryFullTextIndexExpressionProtocol
@protocol
    CBLQueryFullTextIndexExpressionProtocol <CBLQueryIndexExpressionProtocol>Full-Text Index Expression.
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                  Specifies an alias name of the data source in which the index has been created. ss DeclarationObjective-C - (nonnull id<CBLQueryIndexExpressionProtocol>)from:(nonnull NSString *)alias;Return ValueThe full-text index expression referring to a full text index in the specified data source. 
 CBLQueryFullTextIndexExpressionProtocol Protocol Reference
        CBLQueryFullTextIndexExpressionProtocol Protocol Reference