Cannot update templates - template upgrade service


Using elasticsearch 6.4.2 I cannot update index templates. Here are the logs just after the update attempt (no error returned) :
[2018-10-04T09:38:29,289][INFO ][o.e.c.m.MetaDataIndexTemplateService] [i-0ff969f6299ed49da] adding template [logstash-index-template] for index patterns [.logstash]
[2018-10-04T09:38:29,308][INFO ][o.e.c.m.TemplateUpgradeService] [i-0ff969f6299ed49da] Starting template upgrade to version 6.4.2, 1 templates will be updated and 0 will be removed

Is that a bug or some configuration I'm missing ?


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