Can u try this:
index="xxx_prod" environment="p" (ZS-2200150 OR ZS-2200039 OR ZS-2200044 OR ZS-2200045 OR ZS-2200046 OR ZS-2200068 OR yyy-021024 OR ZS-2200054 OR ZS-2200056 OR ZS-2200046 OR ZS-2100018 OR xxx-050001) | eval week=strftime(_time, "%V/%Y") | eval error_text=if(like(error_text,"%%"),"Ohne Bezug dürfen ausschließlich wechselwirkungsrelevante Abgaben gespeichert werden", error_text) | rex field=error_text mode=sed "s/..$//" | rex field=error_text mode=sed "s/(.$//" | rex field=error_code mode=sed "s/xxxx-050003/EMED-021024/g" | eval error_text2 = replace(error_text,",", " ") | eval Fehlermeldung=error_code. " " .error_text2. " - " .environment . " - " . application1 | rex field=_raw "IP: (?[^,]+)" | chart dc(ip2) AS "Unique IP" count(Fehlermeldung) over week by Fehlermeldung | sort Fehlermeldung
Let me know if this helps!!
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