Use EdAdmin4 to review the ServerConfig.xml (access to Application Configuration/Portal Applications and then search for the serverconfig).
If the system is using Solr/Stanbol full-text search
Locate the lines starting with <Solr and <Stanbol. The name of the server is shown after http://.
<Solr
IndexName="GN4Main"
SearchAPIAddress="http://gn4testing:8983/solr"
PushAPIAddress="http://gn4testing:8983/solr"
UserName="search"
Password="search"
/>
<Stanbol
ServerAddress="http://gn4testing:8080"
/>
If the system is using MySQL full-text search
Work in progress
If the system is using Exalead full-text search
Locate the line <Exalead BaseCommandUrlV5 and then look at the IP in it: this the IP of the Exalead server.
<Exalead BaseCommandUrlV5="http://10.1.1.156:22010/search-api/search"
If the system is using SQL full-text search
No information.
If the system is using Oracle full-text search
No information.