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dtSearch Text Retrieval Engine Programmer's Reference
IOptions::UnicodeFilterMinTextSize Property
__property long UnicodeFilterMinTextSize;

Minimum length of a run of text when applying the Unicode Filtering algorithm. 

This option specifies how many text characters must occur consecutively for a block of text to be included. At the default value, 6, a series of 5 text characters surrounded by non-text data would be filtered out.