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Beta A/B test of new search auto-completion generator.
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Description

The new auto-completion functionality from the Discovery team has been integrated as a generator in the API (T121430), which means that we can plug it in when performing searches from our Search bar. We can now do an A/B test of the old prefixsearch vs. the new autocompletion, and measure the resulting clickthrough rate.

  • This should be feature-flagged for Beta only, since the generator itself is still experimental.
  • No changes needed in the EL funnel, AFAICT. Just switch out the generator!

Event Timeline

Dbrant raised the priority of this task from to Needs Triage.
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Change 271304 had a related patch set uploaded (by Mholloway):
Implement A/B test for beta search autocomplete feature

https://gerrit.wikimedia.org/r/271304

Change 271304 merged by jenkins-bot:
Implement A/B test for beta search autocomplete feature

https://gerrit.wikimedia.org/r/271304

Checked the all search test cases - Boolean, exclusion, wildcards, prefixes(special prefixes) - nothing jumped out as incorrect.
Looked at T121616: EPIC: Resolve technical or product blockers to enable us to do a more full rollout of the completion suggester - to check if there are relevant un-fixed cases.
Looked at T122932: CompletionSuggester prefers perfect redirect match over near-perfect target match - it's fixed in my opinion.

Only two things - quite minor in my opinion.:

  • with Beta feature enabled - the search results for search test cases as *end and *begin differs from when the same search is made with the disabled feature. But it's difficult to evaluate which search is more relevant in this case.

Screenshot_2016-02-19-13-46-38.png (1×1 px, 289 KB)

Screenshot_2016-02-19-13-46-52.png (1×1 px, 227 KB)

Clear the search results, if any. Disable the beta feature and force the app to stop. Re-launch and re-enter *end and *begin as search criteria.

Screenshot_2016-02-19-13-13-27.png (1×1 px, 258 KB)

Screenshot_2016-02-19-13-13-47.png (1×1 px, 292 KB)

  • Searching for 'mexico city public transportation' resulted with search results in slightly different positions on the Search list depending whether the beta feature was enabled or not.