I didn't read all the change nodes, but the run of 7.13.x and 7.14 seems to have been mostly security fixes in Elasticsearch. IMHO, the beats often get released just to keep the versions in sync.
FYI, there are other posts about filebeat-god like Filebeat-god description? - #3 by paulkeogh. Did you notice what your old version of filebeat was? I wonder if it was older, I don't find file in my current install.