Feature: API to get most used labels (#447)

* Add most-used labels API

* Filter conversation by labels

* Move match_all to any query

Co-authored-by: Pranav Raj S <pranavrajs@gmail.com>

config/routes.rb

@@ -39,7 +39,11 @@ Rails.application.routes.draw do
       resources :accounts, only: [:create]
       resources :inboxes, only: [:index, :destroy]
       resources :agents, except: [:show, :edit, :new]
-      resources :labels, only: [:index]
+      resources :labels, only: [:index] do
+        collection do
+          get :most_used
+        end
+      end
       resources :canned_responses, except: [:show, :edit, :new]
       resources :inbox_members, only: [:create, :show], param: :inbox_id
       resources :facebook_indicators, only: [] do