mongodb - 未在ElasticSearch中添加Mongo '_id'字段

Question

我正在使用ElasticSearch和mongoosastic在我们的MongoDB和ElasticSearch之间同步数据。

我遇到的问题是，当我在ElasticSearch中对数据进行搜索时，它没有返回对象的'_id'属性。最有可能的原因是我没有正确告知，但找不到任何文档。

我告诉mongoosastic从Mongo同步到ElasticSearch的对象的虚拟示例如下所示:

var userSchema = new mongoose.Schema({
        name: {type:String,es_indexed:true},
        phone: {type:String,es_indexed:true},
        settings:{type:[String],es_indexed:true,index:'not_analyzed'}
}, {id: true});

userSchema.plugin(mongoosastic,settings.elasticSearch);

var User = mongoose.model('User', userSchema);

User.createMapping(function(err, mapping){
    if(err){
        console.log('error creating User mapping (you can safely ignore this)');
        console.log(err);
    }else{
        console.log('User mapping created!');
        console.log(mapping);
    }
});

当我在ElasticSearch上运行 _search 时，得到的结果具有以下结构

    {
        "_index": "users",
        "_type": "user",
        "_id": "54b3ea9619160d0b0080d751",
        "_score": 1,
        "_source": {
           "name": "John Smith",
           "phone": "JohnSmith@gmail.com",
           "settings": []
        }
     }

任何想法如何将mongo对象的_id放入_source对象？

Answer 1

问题是默认情况下，Elasticsearch不会索引或存储id字段:

_id

Each document indexed is associated with an id and a type. The _id field can be used to index just the id, and possible also store it. By default it is not indexed and not stored (thus, not created).

The _id field can be enabled to be indexed, and possibly stored, using the appropriate mapping attributes:

{
    "tweet" : {
        "_id" : {
            "index" : "not_analyzed",
            "store" : true
        }
    }
}

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-id-field.html

问题将是如何将“store”:true参数传递到mongoosastic的createMapping函数中。您可能需要使用createMapping函数进行一些操作，自行修改代码或尝试在索引任何数据之前手动创建Elasticsearch映射。