Increase logging verbosity on update_search_index task
Increase logging verbosity on update_search_index task

to gain insight into CR-3119/TNL-7866.
We know that one or more errors are occuring during this job, but it's
not obvious what these errors are.

EDUlib/edx-platform,arbrandes/edx-platform,eduNEXT/edx-platform,eduNEXT/edunext-platform,edx/edx-platform,edx/edx-platform,edx/edx-platform,angelapper/edx-platform,stvstnfrd/edx-platform,angelapper/edx-platform,eduNEXT/edx-platform,arbrandes/edx-platform,eduNEXT/edunext-platform,stvstnfrd/edx-platform,stvstnfrd/edx-platform,eduNEXT/edunext-platform,angelapper/edx-platform,eduNEXT/edunext-platform,arbrandes/edx-platform,stvstnfrd/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,eduNEXT/edx-platform,EDUlib/edx-platform,arbrandes/edx-platform,EDUlib/edx-platform,EDUlib/edx-platform,edx/edx-platform