
This log will contain one list for each time in history that the pop-up appeared, again typically once. In addition to the popup, the packages being updated will be also be logged in the file $UserBaseDirectory"/Logs/DocumentationSearch/MissingIndexCreation.m". It will only appear a second time if a new package with only old-style indices is installed. In general, you will only see the pop-up once.
#Mathematica 11.2 update update
Also, in certain rare cases another open dynamic can trigger an update at just the wrong instant, which may cause a momentary freeze and the content of the pop-up to fail to render. We've found the time to generate the indices is highly variable-from a second or two to as much as 30 seconds. A popup will appear explaining what is happening and listing the affected packages. In order to not break all currently existing external packages, in the first search in each session the new doc search will scan for packages which only have old-style indices, load the old search code, and generate new-style indices from the old ones.

Internal packages have been rewritten to produce both types of indices (package developers will see a new TextSearchIndex next to the Index directory in the package layout) for maximum compatibility. And for reasons of performance, the new system will generally ignore the old indices. This version is incompatible with the search indices created by previous versions, nor can previous versions read the new indices. Version 11.2 features a completely rewritten documentation search system.
