Kibana not recognizing a date

[Djelouah_Laala (Djelouah Laâla)]

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"
	}	
}