我有一个查询，我想在其中添加一个 Must_not 子句，该子句将丢弃某些字段具有空白数据的所有记录。我尝试了很多方法，但没有一个有效。当我对其他特定字段发出相同的查询（如下所述）时，它工作正常。
此查询应获取没有“registrationType1”字段为空/空白的所有记录
query:
{
"size": 20,
"_source": [
"registrationType1"
],
"query": {
"bool": {
"must_not": [
{
"term": {
"registrationType1": ""
}
}
]
}
}
}
下面的结果仍然包含带有空值的“registrationType1”
results:
**"_source": {
"registrationType1": ""}}
, * {
"_index": "oh_animal",
"_type": "animals",
"_id": "3842002",
"_score": 1,
"_source": {
"registrationType1": "A&R"}}
, * {
"_index": "oh_animal",
"_type": "animals",
"_id": "3842033",
"_score": 1,
"_source": {
"registrationType1": "AMHA"}}
, * {
"_index": "oh_animal",
"_type": "animals",
"_id": "3842213",
"_score": 1,
"_source": {
"registrationType1": "AMHA"}} …