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Index creation does not have an effect if the index is present already.
Index removal does not have an affect if the index is not present.

This helps to avoid patterns like this in migrations:
```
if index_exists?(...)
  remove_concurrent_index(...)
end
```

In gitlab-org/gitlab-ce!17807 the `package-qa` job was renamed to
`package-and-qa`. But it was not renamed in the docs. So this change
fixes that.