Page size is displayed incorrectly

### Description of the bug

When the page size is 1000 or above, it gets displayed incorrectly in the CLI
```Indexing 10,104 posts, 2 at a time, starting on page 1```
when it should be
```Indexing 10,104 posts, 2,000 at a time, starting on page 1```

### Steps To Reproduce

run `wp searchpress index --flush --put-mapping` with a page size >= 1000

### Additional Information

_No response_