- Also use fuzzy search, such as the Levenshtein distance:
  <https://www.postgresql.org/docs/9.5/static/fuzzystrmatch.html>
- The list of additional fields to search could benefit from caching,
  for efficiency.
- This feature could also be implemented for regular `search` on the
  `name` field.
- While adding m2o or other related field that also have an improved
  name search, that improved name search is not used (while if
  name_search is customizend on a module and you add a field of that
  model on another model it works ok). Esto por ejemplo es en productos
  si agregamos campo "categoría pública" y a categoría pública le
  ponemos "parent_id". Entonces vamos a ver que si buscamos por una
  categoría padre no busca nada, en vez si hacemos esa lógica en
  name_search de modulo si funciona