code: protected void addNotEqualsCondition(final String propertyName, final String value) {
          fieldConditions.add(getCriteriaBuilder().notEqual(getRootPath().get(propertyName).as(String.class), value));
      }
docs: Add a Field Search Condition that will search a field for a specified value using the following SQL logic:
  {@code field != 'value'}
  
  @param propertyName The name of the field as defined in the Entity mapping class.
  @param value        The value to search against.