docs: Use stackexchange based example to make documentation easier to understand
This commit is contained in:
Martijn van Groningen
parent
829f7cb658
commit
b88cfe2008
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@ -17,7 +17,7 @@ PUT my_index
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"my_join_field": { <1>
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"type": "join",
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"relations": {
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"my_parent": "my_child" <2>
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"question": "answer" <2>
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}
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}
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}
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@ -28,34 +28,34 @@ PUT my_index
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// CONSOLE
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<1> The name for the field
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<2> Defines a single relation where `my_parent` is parent of `my_child`.
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<2> Defines a single relation where `question` is parent of `answer`.
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To index a document with a join, the name of the relation and the optional parent
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of the document must be provided in the `source`.
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For instance the following creates two parent documents in the `my_parent` context:
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For instance the following creates two parent documents in the `question` context:
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[source,js]
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--------------------------------------------------
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PUT my_index/doc/1?refresh
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{
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"text": "This is a parent document",
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"text": "This is a question",
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"my_join_field": {
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"name": "my_parent" <1>
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"name": "question" <1>
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}
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}
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PUT my_index/doc/2?refresh
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{
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"text": "This is a another parent document",
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"text": "This is a another question",
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"my_join_field": {
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"name": "my_parent"
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"name": "question"
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[continued]
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<1> This document is a `my_parent` document.
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<1> This document is a `question` document.
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When indexing parent documents, you can choose to specify just the name of the relation
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as a shortcut instead of encapsulating it in the normal object notation:
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@ -64,14 +64,14 @@ as a shortcut instead of encapsulating it in the normal object notation:
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--------------------------------------------------
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PUT my_index/doc/1?refresh
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{
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"text": "This is a parent document",
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"my_join_field": "my_parent" <1>
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"text": "This is a question",
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"my_join_field": "question" <1>
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}
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PUT my_index/doc/2?refresh
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{
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"text": "This is a another parent document",
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"my_join_field": "my_parent"
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"text": "This is another question",
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"my_join_field": "question"
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}
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--------------------------------------------------
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// CONSOLE
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@ -85,7 +85,6 @@ must be added in the `_source`.
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WARNING: It is required to index the lineage of a parent in the same shard so you must
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always route child documents using their greater parent id.
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For instance the following index two children documents pointing to the same parent `1`
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with a `routing` value equals to the `id` of the parent:
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@ -93,18 +92,18 @@ with a `routing` value equals to the `id` of the parent:
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--------------------------------------------------
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PUT my_index/doc/3?routing=1&refresh <1>
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{
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"text": "This is a child document",
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"text": "This is an answer",
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"my_join_field": {
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"name": "my_child", <2>
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"name": "answer", <2>
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"parent": "1" <3>
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}
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}
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PUT my_index/doc/4?routing=1&refresh
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{
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"text": "This is a another child document",
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"text": "This is another answer",
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"my_join_field": {
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"name": "my_child",
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"name": "answer",
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"parent": "1"
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}
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}
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@ -113,12 +112,12 @@ PUT my_index/doc/4?routing=1&refresh
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// TEST[continued]
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<1> This child document must be on the same shard than its parent
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<2> `my_child` is the name of the join for this document
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<2> `answer` is the name of the join for this document
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<3> The parent id of this child document
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==== Parent-join restrictions
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* Only one `join` field is allowed per index mapping.
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* Only one `join` field mapping is allowed per index.
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* Parent and child documents must be indexed on the same shard.
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This means that the same `routing` value needs to be provided when
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<<docs-get,getting>>, <<docs-delete,deleting>>, or <<docs-update,updating>>
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@ -175,8 +174,8 @@ Will return:
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"_id": "1",
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"_score": null,
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"_source": {
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"text": "This is a parent document",
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"my_join_field": "my_parent" <1>
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"text": "This is a question",
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"my_join_field": "question" <1>
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},
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"sort": [
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"1"
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@ -188,8 +187,8 @@ Will return:
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"_id": "2",
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"_score": null,
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"_source": {
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"text": "This is a another parent document",
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"my_join_field": "my_parent" <2>
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"text": "This is another question",
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"my_join_field": "question" <2>
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},
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"sort": [
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"2"
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@ -202,9 +201,9 @@ Will return:
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"_score": null,
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"_routing": "1",
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"_source": {
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"text": "This is a child document",
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"text": "This is an answer",
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"my_join_field": {
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"name": "my_child", <3>
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"name": "answer", <3>
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"parent": "1" <4>
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}
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},
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@ -219,9 +218,9 @@ Will return:
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"_score": null,
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"_routing": "1",
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"_source": {
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"text": "This is a another child document",
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"text": "This is another answer",
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"my_join_field": {
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"name": "my_child",
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"name": "answer",
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"parent": "1"
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}
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},
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@ -235,9 +234,9 @@ Will return:
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--------------------------------------------------
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// TESTRESPONSE[s/\.\.\./"timed_out": false, "took": $body.took, "_shards": $body._shards/]
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<1> This document belongs to the `my_parent` join
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<2> This document belongs to the `my_parent` join
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<3> This document belongs to the `my_child` join
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<1> This document belongs to the `question` join
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<2> This document belongs to the `question` join
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<3> This document belongs to the `answer` join
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<4> The linked parent id for the child document
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==== Parent-join queries and aggregations
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@ -257,14 +256,14 @@ GET my_index/_search
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{
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"query": {
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"parent_id": { <1>
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"type": "my_child",
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"type": "answer",
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"id": "1"
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}
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},
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"aggs": {
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"parents": {
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"terms": {
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"field": "my_join_field#my_parent", <2>
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"field": "my_join_field#question", <2>
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"size": 10
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}
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}
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@ -272,7 +271,7 @@ GET my_index/_search
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"script_fields": {
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"parent": {
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"script": {
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"source": "doc['my_join_field#my_parent']" <3>
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"source": "doc['my_join_field#question']" <3>
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}
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}
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}
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@ -315,7 +314,7 @@ PUT my_index
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"my_join_field": {
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"type": "join",
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"relations": {
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"my_parent": "my_child"
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"question": "answer"
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},
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"eager_global_ordinals": false
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}
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@ -332,10 +331,10 @@ as follows:
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[source,sh]
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--------------------------------------------------
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# Per-index
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GET _stats/fielddata?human&fields=my_join_field#my_parent
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GET _stats/fielddata?human&fields=my_join_field#question
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# Per-node per-index
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GET _nodes/stats/indices/fielddata?human&fields=my_join_field#my_parent
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GET _nodes/stats/indices/fielddata?human&fields=my_join_field#question
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--------------------------------------------------
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// CONSOLE
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// TEST[continued]
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@ -354,7 +353,7 @@ PUT my_index
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"my_join_field": {
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"type": "join",
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"relations": {
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"my_parent": ["my_child", "another_child"] <1>
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"question": ["answer", "comment"] <1>
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}
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}
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}
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@ -364,7 +363,7 @@ PUT my_index
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--------------------------------------------------
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// CONSOLE
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<1> `my_parent` is parent of `my_child`.
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<1> `question` is parent of `answer` and `comment`.
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And multiple levels of parent/child:
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@ -378,8 +377,8 @@ PUT my_index
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"my_join_field": {
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"type": "join",
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"relations": {
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"my_parent": ["my_child", "another_child"], <1>
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"another_child": "grand_child" <2>
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"question": ["answer", "comment"], <1>
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"answer": "vote" <2>
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}
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}
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}
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@ -389,18 +388,18 @@ PUT my_index
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--------------------------------------------------
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// CONSOLE
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<1> `my_parent` is parent of `my_child` and `another_child`
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<2> `another_child` is parent of `grand_child`
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<1> `question` is parent of `answer` and `comment`
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<2> `answer` is parent of `vote`
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The mapping above represents the following tree:
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my_parent
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question
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/ \
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/ \
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my_child another_child
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comment answer
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grand_child
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vote
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Indexing a grand child document requires a `routing` value equals
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to the grand-parent (the greater parent of the lineage):
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@ -410,9 +409,9 @@ to the grand-parent (the greater parent of the lineage):
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--------------------------------------------------
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PUT my_index/doc/3?routing=1&refresh <1>
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{
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"text": "This is a grand child document",
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"text": "This is a vote",
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"my_join_field": {
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"name": "grand_child",
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"name": "vote",
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"parent": "2" <2>
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}
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}
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@ -421,6 +420,6 @@ PUT my_index/doc/3?routing=1&refresh <1>
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// TEST[continued]
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<1> This child document must be on the same shard than its grandparent and parent
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<2> The parent id of this document (must points to an `another_child` document)
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<2> The parent id of this document (must points to an `answer` document)
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