Index on field with data type GUID drops after compressing a file geodatabase, un-compressing the geodatabase does not restore the dropped index. Index on other data types remain intact.
Issue is reproducible with ArcGIS 10.2\10.6.1 and ArcGIS Pro 2.5
Steps to Reproduce
1. Create a field with data type as GUID in a feature class.
2. Create an index on the field created in step 1.
3. Compress the file geodatabase.