[DOCS] Enable code snippet testing in open job API (elastic/x-pack-elasticsearch#3053)

* [DOCS] Enable code snippet testing in open job API

* [DOCS] Fixed open job API example

Original commit: elastic/x-pack-elasticsearch@f789041c2a

docs/build.gradle

@@ -74,7 +74,6 @@ buildRestTests.expectedUnconvertedCandidates = [
         'en/rest-api/ml/get-datafeed-stats.asciidoc',
         'en/rest-api/ml/get-job-stats.asciidoc',
         '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/update-datafeed.asciidoc',
         'en/rest-api/ml/update-job.asciidoc',

docs/en/rest-api/ml/open-job.asciidoc

@@ -13,8 +13,6 @@ A job can be opened and closed multiple times throughout its lifecycle.
 
 ==== Description
 
-A job must be open in order to it to accept and analyze data.
-
 When you open a new job, it starts with an empty model.
 
 When you open an existing job, the most recent model state is automatically loaded.
@@ -39,22 +37,22 @@ The job is ready to resume its analysis from where it left off, once new data is
 You must have `manage_ml`, or `manage` cluster privileges to use this API.
 For more information, see
 {xpack-ref}/security-privileges.html[Security Privileges].
-//<<privileges-list-cluster>>.
 
 
 ==== Examples
 
-The following example opens the `event_rate` job and sets an optional property:
+The following example opens the `total-requests` job and sets an optional
+property:
 
 [source,js]
 --------------------------------------------------
-POST _xpack/ml/anomaly_detectors/event_rate/_open
+POST _xpack/ml/anomaly_detectors/total-requests/_open
 {
   "timeout": "35m"
 }
 --------------------------------------------------
 // CONSOLE
-// TEST[skip:todo]
+// TEST[setup:server_metrics_job]
 
 When the job opens, you receive the following results:
 [source,js]
@@ -63,3 +61,5 @@ When the job opens, you receive the following results:
   "opened": true
 }
 ----
+//CONSOLE
+// TESTRESPONSE