Organizr 7.1 upgrades the elastic search client version for Elastic Search versions 7.x
After installing Organizr 7.1.0 an Organizr RE-INDEX is strongly recommended to update the Organizr search index. To re-index goto Bitbucket admin > Organizr. You will see a warning box suggesting to re-index. Perform an Organizr re-index. Note that this is NOT a Bitbucket-wide repository index.
More info on Organizr indexing here