Confluence 6.
introduces Synchrony (allowing collaborative editing) which cannot accept AJP connections. The preferred configuration is Using Apache with mod_proxy.
Unfortunately, I believe there is a mistake in the Confluence instructions... so after posting my questions here are my notes to figure this all out.
ProxyRequests Off
I believe I've found the error. It probably has to do with the search engine. On the test server's application server - with more memory and updated OS - making this batch.js request results in a response. However, on the restricted environment it does not,
wget http://localhost:8090/wiki/s/ca6b4214dc4957e5b90edfd999cd552a-CDN/en_US/8100/e6b42acaec191a9bce4ab234dae0b1b08af15496/e00352cb0013a1867dc5de3984f0fae4/_/download/contextbatch/js/confluence-search-ui-plugin-main,-_super/batch.js?locale=en-US