Need help to setup search gurd

Can some one provide me document to setup Search Guard on Elasticsearch (Search Gurd search-guard-6-6.4.1-23.1 and Elastic 6.4.1).

Our enviornment is 5 node cluster 3 Master nodes and 2 data nodes with 2 indexs , I would like to know how to setup and how many certs need to generate .

When asking questions, please provide the following information:

  • Search Guard and Elasticsearch version
    Search Gurd search-guard-6-6.4.1-23.1 and Elastic 6.4.1

  • Installed and used enterprise modules, if any
    Non enterpise module

  • JVM version and operating system version

  • Search Guard configuration files

  • Elasticsearch log messages on debug level

  • Other installed Elasticsearch or Kibana plugins, if any