The `hoogle` created by `stack hoogle` doesn't contain base package

My local `hoogle` doesn't contain the document `base` package while my versions is as below.

```shell
~/p/api-diqye[1]>stack --version
Version 2.11.1, Git revision c1167a6abc3f4978ccded5ba0246a57387da0e2f x86_64 hpack-0.35.2
~/p/api-diqye>cat stack.yaml | grep resolver 0.102s (main|✚↑1) 00:07
# A snapshot resolver dictates the compiler version and the set of packages
# resolver: lts-3.5
# resolver: nightly-2015-09-21
# resolver: ghc-7.10.2
# resolver: ./custom-snapshot.yaml
# resolver: https://example.com/snapshots/2018-01-01.yaml
# resolver: lts-16.26
# resolver:
# resolver: nightly-2021-11-06
resolver: lts-20.13
# Dependency packages to be pulled from upstream that are not in the resolver.
~/p/api-diqye>
```
After I have generated database by runing `stack hoogle setup/rebuild`, it seems like as below