Solve the error of running Elasticsearch by root in centos.

Solve the error of running Elasticsearch by root in centos.

Run Elasticsearch 6.5 on CentOS 2.3. The exception is as follows:

Exception in thread "main" java.lang.RuntimeException: don't run elasticsearch as root.         at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:93)        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:144)        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:270)        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)Refer to the log for complete error details.

Exception Description: Elasticsearch cannot be run with the root permission. The solution is to add a parameter during the runtime:

bin/elasticsearch -Des.insecure.allow.root=true

Or modify bin/elasticsearch with the ES_JAVA_OPTS attribute:

ES_JAVA_OPTS="-Des.insecure.allow.root=true"

Then restart Elasticsearch.