[7.x] [APM][docs] Add troubleshooting for non-indexed fields (#54948)#57136

bmorelli25 wants to merge 1 commit intoelastic:7.xelastic/kibana:7.xfrom

bmorelli25:backport/7.x/pr-54948bmorelli25/kibana:backport/7.x/pr-54948Copy head branch name to clipboard