By default, all text tokens are converted to uppercase and then indexed. This conversion results in case-insensitive queries. For example, queries on cat, CAT, and Cat return the same documents.

You can change the default and have the index record tokens as they appear in the text. When you create a case-sensitive index, you must specify your queries with the exact case to match documents. For example, if a document contains Cat, you must specify your query as Cat to match this document. Specifying cat or CAT does not return the document.

To enable or disable case-sensitive indexing, use the mixed_case attribute of the BASIC_LEXER preference.