code: public static Specification<JpaTargetFilterQuery> equalsQuery(final String queryValue) {
          return (targetFilterQueryRoot, query, cb) -> cb.equal(targetFilterQueryRoot.get(JpaTargetFilterQuery_.query),
                  queryValue);
      }
docs: {@link Specification} for retrieving {@link JpaTargetFilterQuery}s based
  on is {@link JpaTargetFilterQuery#getQuery()}.
  
  @param queryValue
  the query of the filter
  @return the {@link JpaTargetFilterQuery} {@link Specification}