To override a search component and add your own search experience, you will have to implement forceCommunity:searchInterface. The sample code snippet is as follows:
<aura:component implements="forceCommunity:searchInterface" access="global"> <div class="search"> <div class="search"> <form class="search-form"> <div class="search-input"> <input class="search-input-field" type="text" placeholder="My Search"/> </div> <input type="hidden" name="language" value="en" /> </form> </div> </div></aura:component>
