What occurs during the back end rebuilding of the model in document management?

During the back end rebuilding of the model in document management, the process primarily focuses on updating the relevance scores that determine document rankings. This step is crucial because relevance scores help in organizing and prioritizing documents based on their significance to the search queries or workflows being executed. By refining these scores, the system can improve the accuracy and efficiency of document retrieval, ensuring that users are presented with the most pertinent information first.

The other choices, while related to document management, do not accurately represent what occurs during the back end rebuilding process. Creating new coding values for documents, permanently deleting low-ranked documents, or altering the layout of the user interface happen in different contexts or stages of document management and are not part of the core function of rebuilding the model. This reinforces the importance of keeping relevance as a distinct aspect of the model's optimization during this phase.