Explanation/Reference:
Without using any custom code, Search service application administrators, site collection administrators, and site owners can help searches respond to the intent of users by creating query rules. In a query rule, you specify conditions and correlated actions. When a query meets the conditions in a query rule, the search system performs the actions specified in the rule to improve the relevance of the search results, such as by narrowing results or changing the order in which results are displayed. For example, a query rule condition could be that a term in a query matches a particular term in a SharePoint term set, or that a query is frequently performed on a particular result source in a search system, such as videos. When the query rule condition is satisfied, a correlated action could be to show a specific item at the top of the search results.
You can configure query rules for one or more result sources, and you can specify the time period during which the query rule is active.
E: To make the query rule active during a particular time period, click Publishing, and then specify the period.
Reference:https://technet.microsoft.com/en-us/library/jj871676.aspx