A comma separated list of collection ids to filter against. Leaving this blank means it will search across all collections.\Collection ids are: acquisition_predictions, acquisitions, addresses, awards, categories, category_groups, closure_predictions, degrees, diversity_spotlights, event_appearances, events, funding_predictions, funding_rounds, funds, growth_insights, growth_predictions, investments, investor_insights, investor_matches, ipo_predictions, ipos, jobs, key_employee_changes, layoff_predictions, layoffs, legal_proceedings, locations, org_similarities, organizations, ownerships, partnership_announcements, people, press_references, principals, product_launches, products, remain_private_predictions, research_insights