code: @NonNull
      @SuppressWarnings({"WeakerAccess", "unused"}) // For library users
      public Searcher addFacetRefinement(@NonNull String attribute, @NonNull String value) {
          return addFacetRefinement(attribute, Collections.singletonList(value), disjunctiveFacets.contains(attribute));
      }
docs: Adds a facet refinement for the next queries.
  <p>
  <b>This method resets the current page to 0.</b>
  
  @param attribute the attribute to refine on.
  @param value     the facet's value to refine with.
  @return this {@link Searcher} for chaining.