use ansible-vault to encrypt multiple files at once

I am using the following structure to separate my host_vars into plaintext and encrypted

ansible
├── ansible.cfg
├── host_vars
│   ├── host1
│   │   ├── vars
│   │   └── vault
│   └── host2
│       ├── vars
│       └── vault
├── inventory
├── site.yaml
└── vars
    └── ansible_vars.yaml

Is there a way, using ansible-vault to encrypt both files named vault or do I have to do them one by one?

Just asking since there are more to come, e.g. in future directories of group_vars etc.

I know this works

ansible-vault encrypt host_vars/host1/vault host_vars/host2/vault

just asking whether there is a more elegant / quick solution

There are a lot of possibilities gives by shell expansions.

Here are two that would be interesting in your case:

• The asterisk * expansion, that is used as a wildcard. Which means that host_vars/*/vault would match both host_vars/host1/vault and host_vars/host2/vault but any other in the future, too.
• Mind that, if, in the future, you have a more complex folder hierarchy host_vars/*/vault will only match one folder level (e.g. it won't match host_vars/level1/host1/vault), but multiple folder levels can be achieved with a double asterisk (actually named globstar): host_vars/**/vault, will match host_vars/host1/vault as well as host_vars/level1/host1/vault
• The brace expansion, on the other hands offer a more granular set of possibilities, for examples, if I have hosts names after the distributions like RedHat[1..5], Ubuntu[1..5] and Debian[1..5], I could target only the Debian and RedHat ones via host_vars/{Ubuntu*,RedHat*}/vault.
  Or only target the three first of them both with host_vars/{Ubuntu{1..3},RedHat{1..3}}/vault, or the three first of them all via host_vars/*{1..3}/vault

As a more practical example, if you where to handle SE via Ansible and would like to encrypt the the files for *.stackexchange.com and stackoverflow.com but not superuser.com or any other Q&A having a specific domain name, given that the hosts are named as their DNS name, you could do

ansible-vault host_vars/{stackoverflow.com,*.stackexchange.com}/vault