I tried to apply Index template setting parameter { "ignore_malformed: true"} and it changes to {"ignore_malformed": "true" } , from boolean to string.
I'm sorry, I thought the problem was that you couldn't install the mapping.
I agree, i think "true" should be true so there must be something wrong with that mapping. I'm not very familiar with the ignore_malformed parameter but the official documentation seems to indicate that you need to set is as a property on the document field which you want to ignore, if it is malformed.
I already tried it in the index settings and got the same result you did, which is why I guess it must be used inside a document field's "properties" element, as I illustrated earlier, not directly under "settings". But I could be wrong about that guess.
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