Sorry, it was my fault, the destination index is logstash-aplicacions-2020.01.01
I've seen in other forum post a possible workaround, but I'm not sure if it would be a good solution, because I would have to apply it for every log input with this format, making even more complicated the processing
I've also seen in the elastic docs, that it seems that is necessary to provide the year month day info, I don't know how it's been working until a few days... I'm starting to thing that maybe developers changed the log format...