code: public BooleanConditionBuilder must(ConditionBuilder... conditionBuilders) {
          if (must == null) {
              must = new ArrayList<>(conditionBuilders.length);
          }
          for (ConditionBuilder conditionBuilder : conditionBuilders) {
              must.add(conditionBuilder.build());
          }
          return this;
      }
docs: Returns this builder with the specified mandatory conditions.
  
  @param conditionBuilders The mandatory conditions to be added.
  @return this builder with the specified mandatory conditions.