icontains doesn't return the correct amount. about django-haystack

[sevmardi]

Additionally, I double checked if eveything in my postgres is being indexed and the right amount. Everything looks good.
I also tried other search examples mentioned here https://django-haystack.readthedocs.io/en/master/searchqueryset_api.html#searchqueryset

All return less and by far icontains returns the most records, yet not the accurate.

[sevmardi]

Update 1:
I tried some other analyzers

ELASTICSEARCH_INDEX_SETTINGS = {
    "settings": {
        "analysis": {
            "filter": {
                "ngram_filter": {
                    "type": "ngram",
                    "min_gram": 2,
                    "max_gram": 20
                }
            },
            "analyzer": {
                "custom_icontains_analyzer": {
                    "type": "custom",
                    "tokenizer": "standard",
                    "filter": ["lowercase", "ngram_filter"]
                }
            }
        }
    },
    "mappings": {
        "properties": {
            "keyword": {
                "type": "text",
                "analyzer": "custom_icontains_analyzer"
            }
        }
    }
}

class RegisteredDomainElasticsearchIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True, use_template=True,  analyzer="custom_icontains_analyzer")
    keyword = indexes.CharField(model_attr='keyword')
    tlds = indexes.MultiValueField()

    def prepare_tlds(self, obj):
        tlds = [tld.name for tld in obj.tlds.all()]
        return tlds

    def get_model(self):
        return RegisteredDomain

It still not working properly with icontains