映射定义不能嵌套在类型[_doc]下，除非include_type_name设置为true

Question

我的API版本是6.3，我尝试创建索引。失败表明"；映射定义不能嵌套在类型[_doc]下，除非include_type_name设置为true。这是我的代码：

CreateIndexRequest indexRequest = new CreateIndexRequest("user");
request.source("{n" +
"    "settings" : {n" +
"        "number_of_shards" : 1,n" +
"        "number_of_replicas" : 0n" +
"    },n" +
"    "mappings" : {n" +
"        "_doc" : {n" +
"            "properties" : {n" +
"                "message" : { "type" : "text" }n" +
"            }n" +
"        }n" +
"    },n" +
"    "aliases" : {n" +
"        "twitter_alias" : {}n" +
"    }n" +
"}", XContentType.JSON);
CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(indexRequest);

在我去除"_doc"；如下，failure说"；无法分析映射[_doc]：没有为字段[properties]"指定类型；。那么我现在该怎么办呢？

request.source("{n" +
"    "settings" : {n" +
"        "number_of_shards" : 1,n" +
"        "number_of_replicas" : 0n" +
"    },n" +
"    "mappings" : {n" +
"       
"            "properties" : {n" +
"                "message" : { "type" : "text" }n" +
"            }n" +
"     
"    },n" +
"    "aliases" : {n" +
"        "twitter_alias" : {}n" +
"    }n" +
"}", XContentType.JSON);

Answer 1

_doc是一个临时类型名称，为了向后兼容而保留，为了准备删除它，请参阅删除类型以了解更多详细信息。

另请参阅时间表以及如何在您的版本上处理此突破性更改

1. 在6.x中创建的索引只允许每个索引有一个类型。任何名称可以用于类型，但只能有一个。首选类型名称为_doc，因此索引API与它们具有相同的路径将在7.0中具有：PUT｛index｝/doc/｛id｝和POST｛index}/doc

另请参阅https://www.elastic.co/guide/en/elasticsearch/reference/7.x/removal-of-types.html#_migrating_multi_type_indices_to_single_type本节介绍了如何在6.X.中使用它

我建议首先尝试使用REST API创建一个索引，看看include_type_name和index.mapping.single_type的组合是否有效，并相应地将其添加到代码中。

Answer 2

原因是一个映射API查询。我修正如下。

# ES6
PUT myindex
{
"settings": {
"number_of_shards": 5,
"number_of_replicas": 2
},
"mappings": {
"_doc": {                 <--------- Delete this layer
"properties": {
"blahblah": {

# ES7
PUT myindex
{
"settings": {
"number_of_shards": 5,
"number_of_replicas": 2
},
"mappings": {
"properties": {
"blahblah": {