Help:$smwgFulltextSearchMinTokenSize

is a configuration parameter that sets the minimum word/token length to help to decide whether MATCH or LIKE operators are to be used for a condition statement of the full-text search. This helps to switch back to LIKE in cases where the minimum threshold is not applicable. The configuration parameter is specific to the relational data stores MySQL and MariaDB. The higher the number set for this configuration parameter the faster the queries will be. However the default setting appears to be the most pragmatic in most cases when querying for meaningful content. The configuration parameter was introduced in .CiteRef::gh:smw:1481

Default setting
This means that the minimum length of words stored in the InnoDB  index is "3".

Changing the default setting
To modify the setting to this configuration parameter, add one of the following lines to your "LocalSettings.php" file after the  call:

This means that the minimum length of words stored in the InnoDB  index is "5". This reduces the size of the index, thus speeding up queries, by omitting common words that are unlikely to be significant in a search context, such as the English words "a", "to" and "and".
 * Increase the the minimum length of words stored

This means that the minimum length of words stored in the InnoDB  index is "1". Only recommended for a CJK languages (Chinese, Japanese, Korean).
 * Reduce the the minimum length of words stored