Indexing 99% to 100% takes too long. What's the reason?

It seems like indexing going from 99% to 100% takes quite a time.
What is the work behind that cause such delay?
Because of it, I can’t estimate the indexing time. :frowning:

Quick question: which version of the product and what platform?

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Couchbase Server 3.0.1 CE

OS: Amazon Linux
vCPU: 4
RAM: 30.5 GB
Disk: 300 GB