Below are the important notes & links for configuring Liferay DXP with Elasticsearch.

• Configuring Elasticsearch – Liferay Help Center – DXP 7.0
• Installing Elasticsearch – Liferay Learn – DXP latest
• Securing Elasticsearch 6.5 with X-Pack – Liferay Help Center – DXP 7.0 with ES 6.5
• Securing Elasticsearch – Liferay Learn – DXP 7.0/7.1/7.2/7.3/7.4 latest with ES 6/7
• Your important files & keywords: jvm.options.d , setenv.sh , elasticsearch.yml , PEM , PKCS#12 , TLS , SSL , keystore , x-pack , osgi config files
• Note:
• Liferay provides enterprise Elasticsearch premium / paid option with monitoring & replication as well.
• Also, check the Liferay Elasticsearch compatibility matrix always.
• When you use connector for Elasticsearch 7 with older DXP Liferay pre 7.3 make sure to blacklist your Elasticsearch 6 connector.
• Make sure to increase your memory allocation (Heap size) of Elasticsearch to right value before moving to production. Some variables are not for production settings and are documented in links provided in various documentation.
• Monitoring Elasticsearch – Liferay Learn
• Cross Cluster Replication – Liferay Learn
• Search Administration and Tuning – Liferay Learn
• Installing and Upgrading a Search Engine – Liferay Learn
• Search Engine Compatibility Matrix – Liferay Help Center
• Configuring Elasticsearch | Elasticsearch Guide [8.6] | Elastic – Refer the right version of Elasticsearch for your Liferay version