Event ID 6760 is logged by Storage Crawler with the description " FP_ATTR_NOT_FOUND_ERR (-10018) |Reason: Attribute with that name not found". At present no issues or loss of functionality have been identified that appear to correspond with this error.
This issue has been addressed as part of the following release:
Enterprise Vault 9.0.3 - Release Details
Enterprise Vault 10.0.1 - Release Details