英文:
Find document by Id with additional filter in Elasticsearch using Java Jest
问题
我正在尝试使用JEST Java API按ID获取文档，并额外检查是否存在某个元素。
例如，假设我有一个Java对象User，它具有id、firstname和lastname字段，如果文档的索引根本没有firstname元素，我想要将其过滤掉。
现在我正在像这样做：
public Optional<User> findById(long id) {
try {
Get action = new Get.Builder(INDEX_ALIAS, String.valueOf(id)).build();
User user = execute(action).getSourceAsObject(User.class);
if (user != null && user.getFirstName() != null) {
return Optional.ofNullable(user);
} else {
return Optional.empty();
}
} catch (NoSuchElementException ex) {
return Optional.empty();
}
}
在查询本身中是否有更好的方式来进行此检查吗？
英文:
I am trying to use JEST Java API to get Document by Id and have an additional check if an element is present
For example lets say I have a java object User having fields id, firstname, lastname and if the index for document does not have firstname element at all I want to filter it out
Right now I am doing it something like this
public Optional<User> findById(long id) {
try {
Get action = new Get.Builder(INDEX_ALIAS, String.valueOf(id)).build();
User user= execute(action).getSourceAsObject(User.class);
if (user!= null && user.getFirstName()!=null)) {
return Optional.ofNullable(user);
} else {
return Optional.empty();
}
} catch (NoSuchElementException ex) {
return Optional.empty();
}
}
Is there a better way to have this check in query itself.
答案1
得分: 1
正如Abhijit所提到的，存在查询可能是您正在寻找的内容。
返回包含字段的索引值的文档。
在High-Level Java客户端中，可以与ExistsQueryBuilder一起使用。
英文:
As Abhijit mentioned, exits query is probably what you are looking for.
> Returns documents that contain an indexed value for a field.
In the High-Level Java Client it can be used with the ExistsQueryBuilder.
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