JSONField workaround on elasticsearch : MapperParsingException

If the method mentioned in the link you posted works (I haven't tested it on JSONField), then you're overriding the wrong method: The method the elasticsearch app uses to prep the field is prepare_FOO where FOO is the field name.

So you need to call your method prepare_web_results() instead of prepare_content_json() since your field is web_results. Now your method prepare_content_json is useless as it will never be called.

If your JSONField has a fixed structure, you should return an object field with the corresponding structure:

class WebTechDoc(Document):    web_results = fields.ObjectField(properties={        "url": fields.TextField(),        "version": fields.TextField(),        "server": fields.TextField()})    def prepare_web_results(self, instance):        results = instance.web_results        url = results.keys()[0]        return {            "url": url,            "version": results[url]["Version"],            "server": results[url]["Server"]        }

Or if you're less concerned about where exactly the search result comes from, you could just map the dictionary to a string and put it in a TextField() instead of an ObjectField(): return f"{instance.web_results}"

class MyType(DocType):    content_json = fields.ObjectField()    def prepare_content_json(self, instance):        return instance.content_json

this solution is working fine. I tried it myself...