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select eid,ent_name from ent_search where enttype_code is NULL;
GET ent_search/_search{ "_source": ["eid","ent_name"], "query": { "bool": { "must_not": { "exists": { "field": "enttype_code" } } } }}
select eid,ent_name from ent_search where enttype_code is NOT NULL;
GET ent_search/_search{ "_source": ["eid","ent_name","enttype_code"], "query": { "constant_score": { "filter": { "exists": { "field": "enttype_code" } } } }}
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