Use LogsDB for profiling events to reduce storage footprint (elastic#122034)

* Use LogsDB for profiling events to reduce storage footprint (~30% for events only)

* Amend number for storage footprint

Author: rockdaboot

x-pack/plugin/core/template-resources/src/main/resources/profiling/component-template/profiling-events.json

@@ -1,6 +1,7 @@
 {
   "template": {
     "settings": {
+      "mode": "logsdb",
       "index": {
         "number_of_shards": 4,
         "auto_expand_replicas": "0-1",
@@ -11,15 +12,22 @@
             "profiling.project.id",
             "k8s.namespace.name",
             "orchestrator.resource.name",
+            "service.name",
             "host.name",
             "container.name",
-            "process.thread.name"
+            "process.thread.name",
+            "@timestamp"
+          ],
+          "order": [
+            "asc",
+            "asc",
+            "asc",
+            "asc",
+            "asc",
+            "asc",
+            "asc",
+            "desc"
           ]
-        },
-        "mapping": {
-          "source": {
-            "mode": "synthetic"
-          }
         }
       },
       "codec": "best_compression"

x-pack/plugin/profiling/src/main/java/org/elasticsearch/xpack/profiling/persistence/ProfilingIndexTemplateRegistry.java

@@ -54,10 +54,12 @@ public class ProfilingIndexTemplateRegistry extends IndexTemplateRegistry {
     // version 11: Added 'profiling.agent.protocol' keyword mapping to profiling-hosts
     // version 12: Added 'profiling.agent.env_https_proxy' keyword mapping to profiling-hosts
     // version 13: Added 'container.id' keyword mapping to profiling-events
-    public static final int INDEX_TEMPLATE_VERSION = 14;
+    // version 14: Stop using using _source.mode attribute in index templates
+    // version 15: Use LogsDB mode for profiling-events-* (~30% smaller storage footprint)
+    public static final int INDEX_TEMPLATE_VERSION = 15;
 
     // history for individual indices / index templates. Only bump these for breaking changes that require to create a new index
-    public static final int PROFILING_EVENTS_VERSION = 5;
+    public static final int PROFILING_EVENTS_VERSION = 6;
     public static final int PROFILING_EXECUTABLES_VERSION = 1;
     public static final int PROFILING_METRICS_VERSION = 2;
     public static final int PROFILING_HOSTS_VERSION = 2;