DOCS make "don't run as root" more explicit

server/sonar-docs/src/pages/setup/get-started-2-minutes.md

@@ -15,7 +15,7 @@ url: /setup/get-started-2-minutes/
 # On Windows, execute:
 C:\sonarqube\bin\windows-x86-xx\StartSonar.bat
 
-# On other operating systems, execute:
+# On other operating systems, as a non-root user execute:
 /opt/sonarqube/bin/[OS]/sonar.sh console
 ```
 

server/sonar-docs/src/pages/setup/install-server.md

@@ -70,9 +70,9 @@ Once all SonarQube tables are using the InnoDB engine, the first thing to do is
 
 ## Installing the Web Server
 
-First, check the [requirements](/requirements/requirements/).  Note that you cannot run the SonarQube server as `root` on Unix-based systems.
+First, check the [requirements](/requirements/requirements/). Then download and unzip the [distribution](http://www.sonarqube.org/downloads/) (do not unzip into a directory starting with a digit). 
 
-Then download and unzip the [distribution](http://www.sonarqube.org/downloads/) (do not unzip into a directory starting with a digit). 
+SonarQube cannot be run as `root` on Unix-based systems, so create a dedicated user account to use for SonarQube if necessary.
 
 _$SONARQUBE-HOME_ (below) refers to the path to the directory where the SonarQube distribution has been unzipped.
 
@@ -197,3 +197,7 @@ http.proxyUser=domain\\user
 ```
 
 For some proxies, the exception "java.net.ProtocolException: Server redirected too many times" might mean an incorrect username or password has been configured.
+
+### Exception java.lang.RuntimeException: can not run elasticsearch as root
+
+SonarQube starts an Elasticsearch process, and the same account that is running SonarQube itself will be used for the Elasticsearch process. Since Elasticsearch cannot be run as `root`, that means SonarQube can't be either. You must choose some other, non-`root` account with which to run SonarQube, preferably an account dedicated to the purpose.

server/sonar-docs/src/pages/setup/operate-server.md

@@ -23,7 +23,7 @@ url: /setup/operate-server/
 
 ## Running SonarQube as a Service on Linux with SystemD
 
-On Unix system using SystemD, you can install SonarQube as a service.
+On Unix system using SystemD, you can install SonarQube as a service. You cannot run SonarQube as `root` in 'nix systems. Ideally, you will created a new account dedicated to the purpose of running SonarQube.
 Let's suppose:
 
 * The user used to start the service is `sonarqube`