What is the alternative way of querying _all?

Elastic Stack Elasticsearch
1

From elasticsearch 6.x _all has been deprecated. I have a matchQuery like below

QueryBuilders.boolQuery()
                        .should(QueryBuilders.matchQuery("_all", typeAndName.name))
                        .should(buildMatchQuery(
                                SearchFields.kObjectNameKey,
                                dataModel.getLowerFieldName(PropertyType.STRING, SearchFields.kObjectNameKey),
                                typeAndName.name));

Can someone suggest someway what is the recommended way of doing the same now?

I am using dynamic mapping. So as mentioned in doc I don't know beforehand what all fields can be there in the index so I cannot use copy_to in index mapping to copy all fields data to some other field to simulate all.

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