我似乎无法理解弹性搜索中的facets的QueryDSL。下面是我的查询对象，以及我的tags数组的映射。我试图让这些基于标签进行分面导航。每个“元素”将在标签数组中关联多个标签[并非所有元素都有标签。有些人会有一个空数组。每个标记都是具有id和tag属性的对象。
我尝试过嵌套的facet方法并得到“标签没有嵌套”的错误，所以我在下面尝试这个。我没有收到错误，但返回JSON中没有facets对象。我一直在使用此页面寻求帮助：http://www.elasticsearch.org/guide/reference/api/search/facets/index.html。
任何人都可以帮我正确格式化并理解这些的组织吗？我感谢任何帮助！
// this is my query object
{
"sort":{ "created_at":{ "order":"desc" } },
"query":{
"constant_score":{
"filter":{
"and":[
{ "missing":{ "field":"parent_id" } },
{ "missing":{ "field":"wall_id" } },
{ "term":{ "active":true } }
]
}
}
},
"facets":{
"tags":{ "terms":{ "field":"tags.tag" } }
}
}
// this is the mapping for the tags array
"tags":{
"type":"nested",
"include_in_parent":true,
"properties":{
"id":{ "type":"integer" },
"tag":{ "type":"string" }
}
},
答案 0 :(得分：7)
我努力复制这个（使用0.18.5），但没有任何运气。下面有一些细节。第一个示例尝试复制您描述的内容。第二个不会将标记映射为include_in_parent，并使用构面请求中的“嵌套”字段。如您所见，在这两种情况下都返回了facet。
这让我相信其他映射或某些文档（不是你提供的样本）出现问题会导致问题。
当您尝试嵌套方法时，也许您使用了“嵌套”：“tags.tag”而不是“嵌套”：“标签”？
（联合国）成功尝试＃1：
使用映射创建索引：
$ curl -XPOST 'http://localhost:9200/testindex/' -d '{
"mappings": {
"element": {
"properties": {
"tags": {
"type": "nested",
"include_in_parent": true,
"properties": {
"id": {
"type": "integer"
},
"tag": {
"type": "string"
}
}
}
}
}
}
}“
索引文件：
$ curl -XPOST 'http://localhost:9200/testindex/element' -d '{
"element_id": 4682,
"parent_id": null,
"wall_id": null,
"username": "John Doe",
"avatar": "56f1bb0a96d02b90e5915ff38ea189ec.jpg",
"title": "Easy Chart is a great easy comparison chart maker for math and...",
"description": "<p>Easy Chart is a great easy comparison chart maker for math and science skills. It even allows you to pick the appropriate chart type.</p>",
"groups": [
{
"id": 6,
"name": "Fourth Grade (All Subjects)",
"name_short": "4th Grade"
},
{
"id": 17,
"name": "Eighth Grade Science",
"name_short": "8th Science"
},
{
"id": 13,
"name": "Seventh Grade Science",
"name_short": "7th Science"
},
{
"id": 9,
"name": "Sixth Grade Science",
"name_short": "6th Science"
}
],
"tags": [
{
"id": 33,
"tag": "iPad"
},
{
"id": 32,
"tag": "iPod"
}
],
"webpages": [],
"videos": [],
"documents": [],
"photos": [],
"reports": [],
"bookmarks": [],
"likes": [],
"dislikes": [],
"element_type": "Post",
"active": true,
"deleted": false,
"updated_at": "2011-11-27T21:37:38-0600",
"created_at": 1322451458000,
"created_at_formatted": "2 weeks ago"
}'
搜索：
$ curl -XPOST 'http://localhost:9200/testindex/element/_search' -d '{
"sort":{ "created_at":{ "order":"desc" } },
"query":{
"constant_score":{
"filter":{
"and":[
{ "missing":{ "field":"parent_id" } },
{ "missing":{ "field":"wall_id" } },
{ "term":{ "active":true } }
]
}
}
},
"facets":{
"tags":{ "terms":{ "field":"tags.tag" } }
}
}'
结果：
{
"took": 4,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1,
"max_score": null,
"hits": [
{
"_index": "testindex",
"_type": "element",
"_id": "RZK41LngTKOhMUS6DXRi7w",
"_score": null,
"_source": {
"element_id": 4682,
"parent_id": null,
"wall_id": null,
"username": "John Doe",
"avatar": "56f1bb0a96d02b90e5915ff38ea189ec.jpg",
"title": "Easy Chart is a great easy comparison chart maker for math and...",
"description": "<p>Easy Chart is a great easy comparison chart maker for math and science skills. It even allows you to pick the appropriate chart type.</p>",
"groups": [
{
"id": 6,
"name": "Fourth Grade (All Subjects)",
"name_short": "4th Grade"
},
{
"id": 17,
"name": "Eighth Grade Science",
"name_short": "8th Science"
},
{
"id": 13,
"name": "Seventh Grade Science",
"name_short": "7th Science"
},
{
"id": 9,
"name": "Sixth Grade Science",
"name_short": "6th Science"
}
],
"tags": [
{
"id": 33,
"tag": "iPad"
},
{
"id": 32,
"tag": "iPod"
}
],
"webpages": [],
"videos": [],
"documents": [],
"photos": [],
"reports": [],
"bookmarks": [],
"likes": [],
"dislikes": [],
"element_type": "Post",
"active": true,
"deleted": false,
"updated_at": "2011-11-27T21:37:38-0600",
"created_at": 1322451458000,
"created_at_formatted": "2 weeks ago"
},
"sort": [
1322451458000
]
}
]
},
"facets": {
"tags": {
"_type": "terms",
"missing": 0,
"total": 2,
"other": 0,
"terms": [
{
"term": "ipod",
"count": 1
},
{
"term": "ipad",
"count": 1
}
]
}
}
}
（联合国）成功尝试＃2：
使用映射创建索引：
$ curl -XPOST 'http://localhost:9200/testindex2/' -d '{
"mappings": {
"element": {
"properties": {
"tags": {
"type": "nested",
"include_in_parent": false,
"properties": {
"id": {
"type": "integer"
},
"tag": {
"type": "string"
}
}
}
}
}
}
}“
索引文件：
$ curl -XPOST 'http://localhost:9200/testindex2/element' -d '{
"element_id": 4682,
"parent_id": null,
"wall_id": null,
"username": "John Doe",
"avatar": "56f1bb0a96d02b90e5915ff38ea189ec.jpg",
"title": "Easy Chart is a great easy comparison chart maker for math and...",
"description": "<p>Easy Chart is a great easy comparison chart maker for math and science skills. It even allows you to pick the appropriate chart type.</p>",
"groups": [
{
"id": 6,
"name": "Fourth Grade (All Subjects)",
"name_short": "4th Grade"
},
{
"id": 17,
"name": "Eighth Grade Science",
"name_short": "8th Science"
},
{
"id": 13,
"name": "Seventh Grade Science",
"name_short": "7th Science"
},
{
"id": 9,
"name": "Sixth Grade Science",
"name_short": "6th Science"
}
],
"tags": [
{
"id": 33,
"tag": "iPad"
},
{
"id": 32,
"tag": "iPod"
}
],
"webpages": [],
"videos": [],
"documents": [],
"photos": [],
"reports": [],
"bookmarks": [],
"likes": [],
"dislikes": [],
"element_type": "Post",
"active": true,
"deleted": false,
"updated_at": "2011-11-27T21:37:38-0600",
"created_at": 1322451458000,
"created_at_formatted": "2 weeks ago"
}'
搜索：
$ curl -XPOST 'http://localhost:9200/testindex2/element/_search' -d '{
"sort":{ "created_at":{ "order":"desc" } },
"query":{
"constant_score":{
"filter":{
"and":[
{ "missing":{ "field":"parent_id" } },
{ "missing":{ "field":"wall_id" } },
{ "term":{ "active":true } }
]
}
}
},
"facets":{
"tags":{ "terms":{ "field":"tags.tag" }, "nested":"tags" }
}
}'
结果：
{
"took": 17,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1,
"max_score": null,
"hits": [
{
"_index": "testindex2",
"_type": "element",
"_id": "_F1TTGJETOipo8kVR7ZXkQ",
"_score": null,
"_source": {
"element_id": 4682,
"parent_id": null,
"wall_id": null,
"username": "John Doe",
"avatar": "56f1bb0a96d02b90e5915ff38ea189ec.jpg",
"title": "Easy Chart is a great easy comparison chart maker for math and...",
"description": "<p>Easy Chart is a great easy comparison chart maker for math and science skills. It even allows you to pick the appropriate chart type.</p>",
"groups": [
{
"id": 6,
"name": "Fourth Grade (All Subjects)",
"name_short": "4th Grade"
},
{
"id": 17,
"name": "Eighth Grade Science",
"name_short": "8th Science"
},
{
"id": 13,
"name": "Seventh Grade Science",
"name_short": "7th Science"
},
{
"id": 9,
"name": "Sixth Grade Science",
"name_short": "6th Science"
}
],
"tags": [
{
"id": 33,
"tag": "iPad"
},
{
"id": 32,
"tag": "iPod"
}
],
"webpages": [],
"videos": [],
"documents": [],
"photos": [],
"reports": [],
"bookmarks": [],
"likes": [],
"dislikes": [],
"element_type": "Post",
"active": true,
"deleted": false,
"updated_at": "2011-11-27T21:37:38-0600",
"created_at": 1322451458000,
"created_at_formatted": "2 weeks ago"
},
"sort": [
1322451458000
]
}
]
},
"facets": {
"tags": {
"_type": "terms",
"missing": 0,
"total": 2,
"other": 0,
"terms": [
{
"term": "ipod",
"count": 1
},
{
"term": "ipad",
"count": 1
}
]
}
}
}