[FTS] Indexing is too slow, causing Integration tests to fail

Context:

I'm maintaining an Open Source project: JHipster it helps customers to start fast by generating a complete application (Java backend, Angular/Vue/React frontend), with their entities, and a complete set of unit and integration tests. It's compatible with multiple databases, including Couchbase, the part that I'm maintaining.

JHipster uses Testcontainers in order to run integration tests.

Issue:

All the integration tests, including Search tests was passing correctly with version 7.0.0. But, beginning from 7.0.1, Search tests are failing. See https://github.com/jhipster/generator-jhipster/pull/17500#issuecomment-1006403276

JHipster uses N1QL Search Function using Spring Data Couchbase:

@Query("#{#n1ql.selectEntity} WHERE #{#n1ql.filter} AND SEARCH(#{#n1ql.bucket}, #{[0]}) #{[1]}")

List<Place> search(String queryString, Pageable pageable);

The integration tests are using a helper function to wait until the document was indexed:

@Test

void searchPlace() throws Exception {

   ...

   // Wait for the place to be indexed

   TestUtil.retryUntilNotEmpty(() -> placeRepository.search("id:" + place.getId()));

   ...

}

public static <T> void retryUntilNotEmpty(Callable<Iterable<T>> iterableCallable) {

        Mono

            .defer(() ->

                Mono

                    .fromCallable(iterableCallable)

                    .flatMapIterable(Function.identity())

                    .next()

                    .switchIfEmpty(Mono.error(new NoSuchElementException()))

            )

            .retry()

            .timeout(Duration.ofSeconds(5))

            .block();

}

I tried to increase the timeout up to 10 min, still nothing. So there maybe so regression beginning from version 7.0.1.