* revert example to use tcp instead of uds

not all platforms will support tcp

* build still using java 11 on travis - try 17

travis says:
To set Oracle JDK 17 as default, install the "oracle-java17-set-default" package.
E.g.: sudo apt install oracle-java17-set-default.

* filter not correct in benchmark doc

• Commit 142a14a
• Compare fb96daf..142a14a
• Branch main

Simon Shanks