Set latency preset in the default ES output (#1996)

Set for Elastic Stack versions >=8.12 the Elasticsearch output preset
latency as the default value. For Elastic Stack versions >=8.0 & < 8.12,
those settings that latency preset configures are added directly to the
output via the config key.

internal/stack/_static/kibana.yml.tmpl

@@ -125,6 +125,20 @@ xpack.fleet.outputs:
     ca_trusted_fingerprint: "${ELASTIC_PACKAGE_CA_TRUSTED_FINGERPRINT}"
     is_default: true
     is_default_monitoring: true
+    {{- if semverLessThan $version "8.12.0" }}
+    # performance tuning preset values optimized for latency
+    # values retrieved from https://www.elastic.co/guide/en/fleet/8.14/es-output-settings.html#es-output-settings-performance-tuning-settings
+    config:
+      bulk_max_size: 50
+      worker: 1
+      queue.mem.events: 4100
+      queue.mem.flush.min_events: 2050
+      queue.mem.flush.timeout: 1s
+      compression_level: 1
+      connection_idle_timeout: 60
+    {{ else }}
+    preset: latency
+    {{ end }}
 
   {{ $logstash_enabled := fact "logstash_enabled" }}
   {{ if eq $logstash_enabled "true" }}

scripts/test-check-packages.sh

@@ -65,7 +65,7 @@ if [ "${PACKAGE_TEST_TYPE:-other}" == "with-logstash" ]; then
   echo "stack.logstash_enabled: true" >> ~/.elastic-package/profiles/logstash/config.yml
 fi
 
-# In case it is tested with Elatic serverless, there should be just one Elastic stack
+# In case it is tested with Elastic serverless, there should be just one Elastic stack
 # started to test all packages. In our CI, this Elastic serverless stack is started 
 # at the beginning of the pipeline and must be running for all packages.
 if [[ "${SERVERLESS}" != "true" ]]; then