code: public Query setNumericFilters(List<String> numerics) {
      StringBuilder builder = new StringBuilder();
      boolean first = true;
      for (String n : numerics) {
        if (!first)
          builder.append(",");
        builder.append(n);
        first = false;
      }
      this.numerics = builder.toString();
      return this;
    }
docs: Add a list of numeric filters separated by a comma. The syntax of one
  filter is `attributeName` followed by `operand` followed by `value.
  Supported operands are `<`, `<=`, `=`, `>` and `>=`. You can have
  multiple conditions on one attribute like for example
  `numerics=price>100,price<1000`.