Search bar not working on some pages Sunspot Solr

I added a search bar to my header, so every page in the application has one. However, the search bar only works on the home page and index pages. When I go to my contact page (just an example) it doesn't work. I have tried redirecting to my search URL, but nothing seems to work. Any suggestions?

search_controller.rb (controller)

class SearchController < ApplicationController

 def index
   @search = Sunspot.search [Dairy, Drink] do
   fulltext params[:search]
 end

 if @search.results.any?
   @results = @search.results
  else
   return redirect_to request_path
  end
 end 

end

search.rb (model)

class Search < ActiveRecord::Base

attr_accessible :title

searchable do
  autosuggest :search_title, :using => :title   
 end
end

_searchbarheader.html.erb (search bar view)

<%= form_tag search_index_path, :method => :get do %>
  <%= text_field_tag :search, params[:search], style:"width:300px; height:30px;" %>
  <%= submit_tag "Search!", :name => nil, class: "btn btn-default"%>
<% end %>

_header.html.erb (header view)

<div class="container-fluid">
    <%= render 'layouts/brand' unless @skip_brand %> 
  <form class="navbar-form navbar-left">
    <%= render 'layouts/searchbarheader' unless @skip_header %>
  </form>

  <div id="navbar" class="navbar-collapse collapse">
    <ul class="nav navbar-nav navbar-right">
        <% if user_signed_in? %>
        <li><%= link_to current_user.name%></li>
        <li><a class="glyphicon glyphicon-cog" href="<%=edit_user_registration_path%>"></a></li>
      <li><%= link_to "Logout", destroy_user_session_path, method: :delete %> </li>  
    <%else%>   
        <li><%= link_to "Login", new_user_session_path %></li>
        <li><%= link_to "Sign up", new_user_registration_path %></li>
    </ul>    
    <%end%>
</div>

My searchbar is rendered into the header, and header rendered into the app. Thank you for any help. Still learning how rails and solr works together.