What are best practices for Global Search?

When looking at my Vardefs, practically every searchable field has a boost value. Most are set to 1.

I want to review all these old settings (we've been on sugar for over 15 years and some custom fields are no longer in use).

I have a few questions:

- What is the best way to review all full search enabled fields for a given module?

- What are best practices in choosing Boost values

- Why are vardefs settings different?

some fields have three values for full_text_search:

      'full_text_search' =>
      array (
        'enabled' => true,
        'searchable' => true,
        'boost' => 1.05,
      ),

Others only the boost

      'full_text_search' =>
      array (
        'boost' => 1.05,
      ),

If there is only a boost value, does that mean that field is full text searchable?

Thanks,
Francesca