Spec coverage and refactor for the api/v1/accounts controllers (#3451)

app/controllers/api/v1/accounts/search_controller.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class Api::V1::Accounts::SearchController < ApiController
+  before_action -> { doorkeeper_authorize! :read }
+  before_action :require_user!
+
+  respond_to :json
+
+  def show
+    @accounts = account_search
+
+    render 'api/v1/accounts/index'
+  end
+
+  private
+
+  def account_search
+    AccountSearchService.new.call(
+      params[:q],
+      limit_param(DEFAULT_ACCOUNTS_LIMIT),
+      resolving_search?,
+      current_account
+    )
+  end
+
+  def resolving_search?
+    params[:resolve] == 'true'
+  end
+end