Add profile and explain parameters to template API

We can now run templates using `explain` and/or `profile` parameters.
Which is interesting when you have defined a complicated profile but want to debug it in an easier way than running the full query again.

You can use `explain` parameter when running a template:

```js
GET /_search/template
{
  "file": "my_template",
  "params": {
    "status": [ "pending", "published" ]
  },
  "explain": true
}
```

You can use `profile` parameter when running a template:

```js
GET /_search/template
{
  "file": "my_template",
  "params": {
    "status": [ "pending", "published" ]
  },
  "profile": true
}
```

1 files changed, 2 insertions, 0 deletions

diff --git a/modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/TransportSearchTemplateAction.java b/modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/TransportSearchTemplateAction.java
index 9df5a29b9c..f323fcf450 100644
--- a/modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/TransportSearchTemplateAction.java
+++ b/modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/TransportSearchTemplateAction.java
@@ -84,6 +84,8 @@ public class TransportSearchTemplateAction extends HandledTransportAction<Search
                 SearchSourceBuilder builder = SearchSourceBuilder.searchSource();
                 builder.parseXContent(new QueryParseContext(searchRequestParsers.queryParsers, parser, parseFieldMatcher),
                     searchRequestParsers.aggParsers, searchRequestParsers.suggesters, searchRequestParsers.searchExtParsers);
+                builder.explain(request.isExplain());
+                builder.profile(request.isProfile());
                 searchRequest.source(builder);
 
                 searchAction.execute(searchRequest, new ActionListener<SearchResponse>() {