Remove fulltext index on posts

app/controllers/search_controller.rb

@@ -40,29 +40,13 @@ def index
     search_string = []
     search_params = {}
     [[:username, username, username_operation], [:title, title, title_operation],
-     [:why, why, why_operation]].each do |si|
+     [:body, body, body_operation], [:why, why, why_operation]].each do |si|
       if si[1].present? && si[1] != '%%'
         search_string << "IFNULL(`posts`.`#{si[0]}`, '') #{si[2]} :#{si[0]}"
         search_params[si[0]] = si[1]
       end
     end
 
-    if body.present?
-      if ['LIKE', 'NOT LIKE'].include?(body_operation) && params[:body_is_like] != '1'
-        # If the operation would be LIKE, hijack it and use our fulltext index for a search instead.
-        # UNLESS... params[:body_is_like] is set, in which case the user has explicitly specified a LIKE query.
-        @results = @results.match_search(body, with_search_score: false, posts: :body)
-      else
-        if params[:body_is_like] == '1' && !user_signed_in?
-          flash[:warning] = 'Unregistered users cannot use LIKE searches on the body field. Please sign in.'
-          redirect_to(search_path) && return
-        end
-        # Otherwise, it's REGEX or NOT REGEX, which fulltext won't do - fall back on search_string and params
-        search_string << "IFNULL(`posts`.`body`, '') #{body_operation} :body"
-        search_params[:body] = body.present? ? body : '%%'
-      end
-    end
-
     @results = @results.where(search_string.join(params[:or_search].present? ? ' OR ' : ' AND '), **search_params)
                        .paginate(page: params[:page], per_page: per_page)
                        .order(Arel.sql('`posts`.`created_at` DESC'))

app/views/search/search.html.erb

@@ -11,10 +11,6 @@
   </div>
   <div class="form-group">
     <%= label_tag :body %>
-    <%= check_box_tag :body_is_like, 1, params[:body_is_like] %>
-    <span class="text-muted">
-      LIKE (<a href="https://github.com/Charcoal-SE/metasmoke/wiki/FAQ:-search">?</a>)
-    </span>
     <% if current_user&.can_use_regex_search? %>
       <%= check_box_tag :body_is_regex, 1, params[:body_is_regex] %> <span class="text-muted">regex</span>
       <%= check_box_tag :body_is_inverse_regex, 1, params[:body_is_inverse_regex] %> <span class="text-muted">invert</span>

db/migrate/20201121023305_drop_fulltext_index_of_posts.rb

@@ -0,0 +1,5 @@
+class DropFulltextIndexOfPosts < ActiveRecord::Migration[5.2]
+  def change
+    remove_index :posts, :body
+  end
+end