Only possible google algorithm updates in May 2019. There are no official google algorithm updates announced this may 2019 but google daily rolls out about 200 algorithms built upon google ranking systems with the amount of information data accessible on the web and google ranking systems are made up of not one, but the whole series of algorithms to give users most useful information what users are searching based up on their query and how search engine works.
Google tiny tweak are shaken up a bit and both chatter and tracking tools are shaken up in May 2019, there is no official google algorithm updates in May 2019 this month but google struggling fixing indexing issues from the start of may month.
Google Indexing Issues in May 2019:
May 22nd 2019 Google indexing issues with stale Search Results
Covered by Barry Schwartz in Searchenginerountable.com website: https://www.seroundtable.com/google-search-algorithm-update-may-22-27615.html
Google Indexing Issue in Brief: May 22nd 2019:
Google is struggling indexing new published posts and continued not to index new fresh posts published by lot of publishers like wsj.com which is seen specially in news publication websites as the update new content with significant shifts in ranking.
SEMrush sensors started showing a high activity and graphs picked up at 9.2/10 with all categories of websites seems to be a possible google algorithm updates in May 2019 but graphs picked up due to google indexing issue – stale search and google declared officially regarding this ranking shifts in SERP.
Issue Fixed on May 22nd after couple of hours.
Google New Indexing Issue on May 24th:
Subsequently the stale search results indexing issue got fixed, again google had indexing issues again this time we don’t know what kind of indexing issue it is. Google officially declared that we are facing indexing issue and we are working on it and gives a clarification that this is not related to previous indexing issue which is on May 22nd issue of stale search results.
We're looking into a new indexing issue that started escalating 6 hours ago. The issue is unrelated to yesterday's outage and we're working hard to resolve it. We'll update this thread when we can provide more information.
— Google Webmasters (@googlewmc) May 24, 2019
This time google took 3 days around to fix this indexing issue.