[DOCS] Add deprecated index pattern APIs (#124065)

docs/api/index-patterns.asciidoc

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+[[index-patterns-api]]
+== Index patterns APIs
+
+deprecated::[8.0.0,Use <<data-views-api>> instead.]
+
+experimental[] Manage {kib} index patterns.
+
+WARNING: Do not write documents directly to the `.kibana` index. When you write directly
+to the `.kibana` index, the data becomes corrupted and permanently breaks future {kib} versions.
+
+WARNING: Use the index patterns API for managing {kib} index patterns instead of lower-level <<saved-objects-api, saved objects API>>.
+
+The following index patterns APIs are available: 
+
+* Index patterns
+    ** <<index-patterns-api-get, Get index pattern API>> to retrieve a single {kib} index pattern
+    ** <<index-patterns-api-create, Create index pattern API>> to create {kib} index pattern
+    ** <<index-patterns-api-update, Update index pattern API>> to partially updated {kib} index pattern
+    ** <<index-patterns-api-delete, Delete index pattern API>> to delete {kib} index pattern
+* Default index pattern
+    ** <<index-patterns-api-default-get, Get default index pattern API>> to retrieve a default index pattern
+    ** <<index-patterns-api-default-set, Set default index pattern API>> to set a default index pattern
+* Fields
+    ** <<index-patterns-fields-api-update, Update index pattern field>> to change field metadata, such as `count`, `customLabel` and `format`
+* Runtime fields
+    ** <<index-patterns-runtime-field-api-get, Get runtime field API>> to retrieve a runtime field
+    ** <<index-patterns-runtime-field-api-create, Create runtime field API>> to create a runtime field
+    ** <<index-patterns-runtime-field-api-upsert, Upsert runtime field API>> to create or update a runtime field
+    ** <<index-patterns-runtime-field-api-update, Update runtime field API>> to partially update an existing runtime field
+    ** <<index-patterns-runtime-field-api-delete, Delete runtime field API>> to delete a runtime field
+
+include::index-patterns/get.asciidoc[]
+include::index-patterns/create.asciidoc[]
+include::index-patterns/update.asciidoc[]
+include::index-patterns/delete.asciidoc[]
+include::index-patterns/default-get.asciidoc[]
+include::index-patterns/default-set.asciidoc[]
+include::index-patterns/update-fields.asciidoc[]
+include::index-patterns/runtime-fields/get.asciidoc[]
+include::index-patterns/runtime-fields/create.asciidoc[]
+include::index-patterns/runtime-fields/upsert.asciidoc[]
+include::index-patterns/runtime-fields/update.asciidoc[]
+include::index-patterns/runtime-fields/delete.asciidoc[]
+

docs/api/index-patterns/create.asciidoc

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+[[index-patterns-api-create]]
+=== Create index pattern API
+++++
+<titleabbrev>Create index pattern</titleabbrev>
+++++
+
+deprecated::[8.0.0,Use <<data-views-api-create>> instead.]
+
+experimental[] Create {kib} index patterns.
+
+[[index-patterns-api-create-request]]
+==== Request
+
+`POST <kibana host>:<port>/api/index_patterns/index_pattern`
+
+`POST <kibana host>:<port>/s/<space_id>/api/index_patterns/index_pattern`
+
+[[index-patterns-api-create-path-params]]
+==== Path parameters
+
+`space_id`::
+  (Optional, string) An identifier for the space. If `space_id` is not provided in the URL, the default space is used.
+
+[[index-patterns-api-create-body-params]]
+==== Request body
+
+`override`:: (Optional, boolean) Overrides an existing index pattern if an
+index pattern with the provided title already exists. The default is `false`.
+
+`refresh_fields`:: (Optional, boolean) Reloads index pattern fields after
+the index pattern is stored. The default is `false`.
+
+`index_pattern`:: (Required, object) The index pattern object. All fields are optional.
+
+[[index-patterns-api-create-request-codes]]
+==== Response code
+
+`200`::
+    Indicates a successful call.
+
+[[index-patterns-api-create-example]]
+==== Examples
+
+Create an index pattern with a custom title:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X POST api/index_patterns/index_pattern
+{
+  "index_pattern": {
+     "title": "hello"
+  }
+}
+--------------------------------------------------
+// KIBANA
+
+Customize the creation behavior:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X POST api/index_patterns/index_pattern
+{
+  "override": false,
+  "refresh_fields": true,
+  "index_pattern": {
+     "title": "hello"
+  }
+}
+--------------------------------------------------
+// KIBANA
+
+At creation, all index pattern fields are optional:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X POST api/index_patterns/index_pattern
+{
+  "index_pattern": {
+      "id": "...",
+      "version": "...",
+      "title": "...",
+      "type": "...",
+      "timeFieldName": "...",
+      "sourceFilters": [],
+      "fields": {},
+      "typeMeta": {},
+      "fieldFormats": {},
+      "fieldAttrs": {},
+      "runtimeFieldMap": {}
+      "allowNoIndex": "..."
+    }
+}
+--------------------------------------------------
+// KIBANA
+
+
+The API returns the index pattern object:
+
+[source,sh]
+--------------------------------------------------
+{
+    "index_pattern": {...}
+}
+--------------------------------------------------
+

docs/api/index-patterns/default-get.asciidoc

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+[[index-patterns-api-default-get]]
+=== Get default index pattern API
+++++
+<titleabbrev>Get default index pattern</titleabbrev>
+++++
+
+deprecated::[8.0.0,Use <<data-views-api-default-get>> instead.]
+
+experimental[] Retrieve a default index pattern ID. Kibana UI uses default index pattern unless user picks a different one.
+
+[[index-patterns-api-default-get-request]]
+==== Request
+
+`GET <kibana host>:<port>/api/index_patterns/default`
+
+`GET <kibana host>:<port>/s/<space_id>/api/index_patterns/default`
+
+[[index-patterns-api-default-get-params]]
+==== Path parameters
+
+`space_id`::
+(Optional, string) An identifier for the space. If `space_id` is not provided in the URL, the default space is used.
+
+[[index-patterns-api-default-get-codes]]
+==== Response code
+
+`200`::
+Indicates a successful call.
+
+[[index-patterns-api-default-get-example]]
+==== Example
+
+Retrieve the default index pattern id:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X GET api/index_patterns/default
+--------------------------------------------------
+// KIBANA
+
+The API returns an ID of a default index pattern:
+
+[source,sh]
+--------------------------------------------------
+{
+    "index_pattern_id": "..."
+}
+--------------------------------------------------
+
+In case there is no default index pattern, the API returns:
+
+[source,sh]
+--------------------------------------------------
+{
+    "index_pattern_id": null
+}
+--------------------------------------------------

docs/api/index-patterns/default-set.asciidoc

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+[[index-patterns-api-default-set]]
+=== Set default index pattern API
+++++
+<titleabbrev>Set default index pattern</titleabbrev>
+++++
+
+deprecated::[8.0.0,Use <<data-views-api-default-set>> instead.]
+
+experimental[] Set a default index pattern ID. Kibana UI will use default index pattern unless user picks a different one. 
+The API doesn't validate if given `index_pattern_id` is a valid id. 
+
+[[index-patterns-api-default-set-request]]
+==== Request
+
+`POST <kibana host>:<port>/api/index_patterns/default`
+
+`POST <kibana host>:<port>/s/<space_id>/api/index_patterns/default`
+
+[[index-patterns-api-default-set-params]]
+==== Path parameters
+
+`space_id`::
+(Optional, string) An identifier for the space. If `space_id` is not provided in the URL, the default space is used.
+
+[[index-patterns-api-default-set-body]]
+==== Request body
+
+`index_pattern_id`:: (Required, `string` or `null`) Sets a default index pattern id. Use `null` to unset a default index pattern.
+
+`force`:: (Optional, boolean) Updates existing default index pattern id. The default is `false`.
+
+
+[[index-patterns-api-default-set-codes]]
+==== Response code
+
+`200`::
+Indicates a successful call.
+
+[[index-patterns-api-default-set-example]]
+==== Example
+
+Set the default index pattern id if none is set:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X POST api/index_patterns/default
+{
+  "index_pattern_id": "..."
+}
+--------------------------------------------------
+// KIBANA
+
+
+Upsert the default index pattern:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X POST api/index_patterns/default
+{
+  "index_pattern_id": "...",
+  "force": true
+}
+--------------------------------------------------
+// KIBANA
+
+Unset the default index pattern:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X POST api/index_patterns/default
+{
+  "index_pattern_id": null,
+  "force": true
+}
+--------------------------------------------------
+// KIBANA
+
+The API returns:
+
+[source,sh]
+--------------------------------------------------
+{
+    "acknowledged": true
+}
+--------------------------------------------------
+

docs/api/index-patterns/delete.asciidoc

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+[[index-patterns-api-delete]]
+=== Delete index pattern API
+++++
+<titleabbrev>Delete index pattern</titleabbrev>
+++++
+
+deprecated::[8.0.0,Use <<data-views-api-delete>> instead.]
+
+experimental[] Delete {kib} index patterns.
+
+WARNING: Once you delete an index pattern, _it cannot be recovered_.
+
+[[index-patterns-api-delete-request]]
+==== Request
+
+`DELETE <kibana host>:<port>/api/index_patterns/index_pattern/<id>`
+
+`DELETE <kibana host>:<port>/s/<space_id>/api/index_patterns/index_pattern/<id>`
+
+[[index-patterns-api-delete-path-params]]
+==== Path parameters
+
+`space_id`::
+  (Optional, string) An identifier for the space. If `space_id` is not provided in the URL, the default space is used.
+
+`id`::
+  (Required, string) The ID of the index pattern you want to delete.
+
+[[index-patterns-api-delete-response-codes]]
+==== Response code
+
+`200`::
+  Indicates that index pattern is deleted. Returns an empty response body. 
+
+==== Example
+
+Delete an index pattern object with the `my-pattern` ID:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X DELETE api/index_patterns/index_pattern/my-pattern
+--------------------------------------------------
+// KIBANA