No, AFAIU the Search Suggestion for Collections needs to be achieved at
project level through custom implementation. No OOTB feature having this
kind of support or close to this requirement.You could use OmniSearch
API to integrate the suggestions with OmniSearch result
page.https://helpx.adobe.com/experience-manager/6-3/sites/developing/using/reference-materials/javadoc/com/adobe/granite/omnisearch/api/core/OmniSearchService.html#getSuggestions(org.apache.sling.api.resource.ResourceResolver,%20...