Ignore malformed field when dynamic: strict

I need to have dynamic:strict in my mapping because I have malformed JSON.
I need to ignore malformed fields for example: (first normal field and secondly malformed)
key1: value1
key which is 1: value1
"key which is 1" is a malformed field which occurs through dependencies and I cannot change it. It get's parsed because I parse k,v with '='
How can I ignore field: "key which is 1" in my index?
If I cannot simply ignore it, elasticsearch rejects the whole document. Which cannot happen. It should index document except this field.
I will be able to set the field before it is indexed because of "dynamic":"strict

Would you be able to send the bad JSON through an ingest node? If so, you can ignore the bad stuff via the JSON processor.

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