Problem resolved : (As Magnus suggest me to do in a previous post)
Magnus solution
There is the issue to my problem. I wish that it can help some of you.
filter
{ mutate
{
convert => [ "txechecczhier_date", "string" ]
}
date
{
match => [ "txechecczhier_date", "ISO8601"]
target => "txechecczhier_date"
}
}