对于lucene搜索语法：
_exists_:field_a AND !_exists_:field_b
对于elasticsearch搜索语法：
{ "query" : { "bool" : { "must" : [ {"exists" : { "field" : "field_a" }} ], "must_not": [ {"exists" : { "field" : "field_b" }} ] } }}
对于lucene搜索语法：
_exists_:field_a AND !_exists_:field_b
对于elasticsearch搜索语法：
{ "query" : { "bool" : { "must" : [ {"exists" : { "field" : "field_a" }} ], "must_not": [ {"exists" : { "field" : "field_b" }} ] } }}名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
