Couchbase health check failed

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I have been facing the “Couchbase health check failed” error, which I have never seen so far:

2019-06-24 20:28:48.026 WARN  1854950 --- [ http-nio-8300-exec-4 ] o.s.b.a.c.CouchbaseHealthIndicator : Couchbase health check failed
java.lang.NullPointerException: null
	at org.springframework.boot.actuate.couchbase.CouchbaseHealth.describe(CouchbaseHealth.java:63)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at org.springframework.boot.actuate.couchbase.CouchbaseHealth.applyTo(CouchbaseHealth.java:46)
	at org.springframework.boot.actuate.couchbase.CouchbaseHealthIndicator.doHealthCheck(CouchbaseHealthIndicator.java:52)
    ...

The search in google didn’t help much, because it was keep bringing link, which talked about timeouts.

TLDR

The port 8093 was not accessible from the application server. link says that couchbase uses this port for query services. But I’m not sure then why does the error doesn’t say about it anything.