"Forecolor searchreplace fontselect fontsizeselect spellcheck" toolbars don't work in tinymce 5

I migrated from TinyMCE v4 to v5.1.4 and some of the toolbars doesn't work. I am integrating editor with my ExtJs application using TinyMCEtexteditor.js file. Other plain/straightforward toolbars work fine for me, but forecolor, searchreplace, fontselect, fontsizeselect and spellcheck toolbars does not work. Mainly those with default dropdown values does not seem to work properly. I get those icons on the screen but the dropdown values are not displayed or functions as expected. This is my code snippet. Kindly suggest if am missing any configuration or I have to make any changes to include even the default dropdown values so that they work as in previous versions.