fix ElasticAgent var

Author: maximilianpohle

internal/install/application_configuration.go

@@ -98,7 +98,7 @@ func checkImageRefOverride(envVar, fallback string) string {
 func (s stack) ImageRefOverridesForVersion(version string) ImageRefs {
 	appConfigImageRefs := s.ImageRefOverrides[version]
 	return ImageRefs{
-		ElasticAgent:  checkImageRefOverride("ELASTIC_AGENT_IMAGE_REF_OVERRIDIS_READY_IMAGE_REFE", stringOrDefault(appConfigImageRefs.ElasticAgent, "")),
+		ElasticAgent:  checkImageRefOverride("ELASTIC_AGENT_IMAGE_REF_OVERRIDE", stringOrDefault(appConfigImageRefs.ElasticAgent, "")),
 		Elasticsearch: checkImageRefOverride("ELASTICSEARCH_IMAGE_REF_OVERRIDE", stringOrDefault(appConfigImageRefs.Elasticsearch, "")),
 		Kibana:        checkImageRefOverride("KIBANA_IMAGE_REF_OVERRIDE", stringOrDefault(appConfigImageRefs.Kibana, "")),
 		Logstash:      checkImageRefOverride("LOGSTASH_IMAGE_REF_OVERRIDE", stringOrDefault(appConfigImageRefs.Logstash, "")),