Relocates data frame section

Author: lcawl

docs/en/stack/data-frames/api-quickref.asciidoc

@@ -0,0 +1,15 @@
+[role="xpack"]
+[[df-api-quickref]]
+== API quick reference
+
+All {dataframe} endpoints have the following base:
+
+[source,js]
+----
+/_data_frame/
+----
+// NOTCONSOLE
+
+The {dataframe-transform} resources can be accessed with {ref}/data-frame-apis.html#data-frame-transform-apis[+/transforms/+] endpoints.
+
+For a full list, see {ref}/data-frame-apis.html[{dataframe-cap} APIs].

docs/en/stack/ml/dataframes.asciidoc renamed to docs/en/stack/data-frames/dataframes.asciidoc

@@ -1,5 +1,9 @@
+[role="xpack"]
 [[ml-dataframes]]
-=== {dataframes-cap}
+= {dataframes-cap}
+
+[partintro]
+--
 
 beta[]
 
@@ -54,4 +58,8 @@ shows the number of sold items in every product category in the last year.
 image::ml/images/ml-dataframepivot.jpg["Example of a data frame pivot in {kib}"]
 
 IMPORTANT: Creating a {dataframe} leaves your source index intact. A new index will 
-be created dedicated to the {dataframe}.
+be created dedicated to the {dataframe}.
+
+--
+
+include::api-quickref.asciidoc[]

docs/en/stack/index.asciidoc

@@ -32,6 +32,8 @@ include::{xes-repo-dir}/watcher/index.asciidoc[]
 :edit_url: https://github.com/elastic/stack-docs/edit/{branch}/docs/en/stack/ml/index.asciidoc
 include::ml/index.asciidoc[]
 
+include::data-frames/dataframes.asciidoc[]
+
 :edit_url: https://github.com/elastic/elasticsearch/edit/{branch}/docs/reference/ccr/index.asciidoc
 include::{es-repo-dir}/ccr/index.asciidoc[]
 

docs/en/stack/ml/overview.asciidoc

@@ -11,4 +11,3 @@ include::buckets.asciidoc[]
 include::calendars.asciidoc[]
 include::rules.asciidoc[]
 include::architecture.asciidoc[]
-include::dataframes.asciidoc[]