Maximum Field

The Maximum Field (maxfield) module behaves identically to the Field module, except in how it scores cross-field matches.

Unlike Field, which assigns a static score to cross-field matches, Maximum Field selects the score of the highest-ranked field that contributed to the match.

Note the following:

Because Maximum Field defines the score for cross-field matches dynamically, it does not make use of the cross-field setting in the search interface.
Maximum Field is only valid for record search operations. This module assigns a score of zero to all results for other types of search requests.
Maximum Field treats all matches the same, whether or not they are due to query expansion.