Await for FTS index to update

When writing tests that involve the FTS engine, I'm stuck with stone age technique of thread cpu-busy loop to wait the FTS engine to index my documents.

I have tried the following :

int retry = 0;

while (cluster.searchQuery("myIndex", SearchQuery.docId(myDocument.getId())).rows().isEmpty()) {
    if (retry > 60) fail("Document indexation in FTS timeout");
    Thread.sleep(1000);
    retry++;
}

But it gave me inconsistent results. I guess it waits for the index to acknowledge the document but the document is not yet ready to be searched. Sometimes, on a small sized machine overwhelmed by test suites, a dozen of seconds can separate acknowledgement from readiness.

Is there a common wait to deal with this ?

Edit : in my tests I'm using FTS inside a N1QL query, I don't know if that matters.

Start by examining the cluster.searchQuery and SearchQuery.docId entry points used in the example, including their use from N1QL queries. Determine how tests can reliably wait for FTS results rather than using a CPU-busy loop; done means a consistent waiting approach for indexed documents.