[DOCS] Enabled code snippet testing for datafeed APIs (elastic/x-pack-elasticsearch#2811)

* [DOCS] Enabled code snippet testing for put datafeed API

* [DOCS] Addressed gradle errors in put datafeed API

* [DOCS] Added job creation test to build.gradle

Original commit: elastic/x-pack-elasticsearch@3548d920c7

docs/build.gradle

@@ -76,7 +76,6 @@ buildRestTests.expectedUnconvertedCandidates = [
         'en/rest-api/ml/get-record.asciidoc',
         'en/rest-api/ml/open-job.asciidoc',
         'en/rest-api/ml/preview-datafeed.asciidoc',
-        'en/rest-api/ml/put-datafeed.asciidoc',
         'en/rest-api/ml/start-datafeed.asciidoc',
         'en/rest-api/ml/stop-datafeed.asciidoc',
         'en/rest-api/ml/update-datafeed.asciidoc',
@@ -200,3 +199,55 @@ setups['my_inactive_watch'] = '''
 '''
 setups['my_active_watch'] = setups['my_inactive_watch'].replace(
         'active: false', 'active: true')
+setups['server_metrics_index'] = '''
+  - do:
+        indices.create:
+          index: server-metrics
+          body:
+            settings:
+              number_of_shards: 1
+              number_of_replicas: 0
+            mappings:
+              metric:
+                properties:
+                  timestamp:
+                    type: date
+                  total:
+                    type: long
+'''
+setups['server_metrics_job'] = '''
+  - do:
+      indices.create:
+        index: server-metrics
+        body:
+          settings:
+            number_of_shards: 1
+            number_of_replicas: 0
+          mappings:
+            metric:
+              properties:
+                timestamp:
+                  type: date
+                total:
+                  type: long
+  - do:
+      xpack.ml.put_job:
+        job_id: "total-requests"
+        body:  >
+          {
+            "description" : "Total sum of requests",
+            "analysis_config" : {
+              "bucket_span":"10m",
+              "detectors" :[
+              {
+                "detector_description": "Sum of total",
+                "function": "sum",
+                "field_name": "total"
+              }
+            ]},
+            "data_description" : {
+              "time_field":"timestamp",
+              "time_format": "epoch_ms"
+            }
+          }
+'''

docs/en/rest-api/ml/put-datafeed.asciidoc

@@ -86,43 +86,37 @@ For more information, see
 
 ==== Examples
 
-The following example creates the `datafeed-it-ops-kpi` {dfeed}:
+The following example creates the `datafeed-total-requests` {dfeed}:
 
 [source,js]
 --------------------------------------------------
-PUT _xpack/ml/datafeeds/datafeed-it-ops-kpi
+PUT _xpack/ml/datafeeds/datafeed-total-requests
 {
-  "job_id": "it-ops-kpi",
-  "indices": ["it_ops_metrics"],
-  "types": ["kpi","network","sql"],
-  "query": {
-    "match_all": {
-          "boost": 1
-    }
-  }
+  "job_id": "total-requests",
+  "indices": ["server-metrics"],
+  "types": ["metric"],
+  "scroll_size": 1000
 }
 --------------------------------------------------
 // CONSOLE
-// TEST[skip:todo]
+// TEST[setup:server_metrics_job]
 
 When the {dfeed} is created, you receive the following results:
 [source,js]
 ----
 {
-  "datafeed_id": "datafeed-it-ops-kpi",
-  "job_id": "it-ops-kpi",
-  "query_delay": "1m",
+  "datafeed_id": "datafeed-total-requests",
+  "job_id": "total-requests",
+  "query_delay": "83474ms",
   "indices": [
-    "it_ops_metrics"
+    "server-metrics"
   ],
   "types": [
-    "kpi",
-    "network",
-    "sql"
+    "metric"
   ],
   "query": {
     "match_all": {
-      "boost": 1
+      "boost": 1.0
     }
   },
   "scroll_size": 1000,
@@ -131,3 +125,4 @@ When the {dfeed} is created, you receive the following results:
   }
 }
 ----
+//TESTRESPONSE[s/"query_delay": "83474ms"/"query_delay": $body.query_delay/]