Which statement is true regarding turning off health index documents?

Turning off health index documents can indeed raise the percentage of highly ranked documents. The health index is designed to evaluate and score documents based on various factors, helping to surface the most relevant documents for review. When this feature is disabled, the system no longer weights documents according to their health scores, which can lead to a situation where documents that may have previously been filtered out or ranked lower are now included in the results.

By lifting potential restrictions on document visibility and ranking, it opens up access to a larger pool of documents that might have significant relevance, hence increasing the likelihood of having a higher proportion of documents considered highly ranked. This can be particularly advantageous in scenarios where the knowledge about the documents is incomplete, allowing for broader insight and review of potentially valuable matches without the constraints imposed by health metrics.