How do the "query" and "suggest" blocks relate in a suggestion request?

Elastic Stack Elasticsearch
1

If I'm doing a suggestion request like below, how do the "query" and "suggest" blocks relate to one another?

POST /_search
{
  "query": {...},
  "suggest": {...},
}
2

Context-suggester maybe what you are looking for.

3

I'm asking what do the two clauses have to do with one another. As far as I can tell, each simply returns its own results, no different than an msearch batch of queries.