Theses rake task sometimes needs to be run more than once

[sandbergja]

Expected behavior

The rake task outputs the correct number of records (~83,000) on the first time.

Actual behavior

We have noticed it outputting ~76,000 records instead. When you re-run it, it behaves as expected.

Steps to replicate

Not sure the exact circumstances, but it is these: https://github.com/pulibrary/bibdata/blob/main/docs/indexing.md#index-theses

Impact of this bug

Adds time and confusion to the full reindex process

Acceptance criteria

• The rake task works reliably