Requirejs with Elasticsearch Angular app throwing Uncaught TypeError: _.extend is not a function

Elastic Stack Elasticsearch
1

I am trying to build Elasticsearch Angular app. I am using require.js.

main.js

require.config({

paths : {
    'angular' : '../bower_components/angular/angular',
    'elasticsearch' : '../bower_components/elasticsearch/elasticsearch',
    'app' : 'app',
    'coreModule':'coreModule',
    'esClient' : 'service/esClient'
},

shim : {
    
    'app':{
        'deps' : ['angular','coreModule']
    },
    
    'coreModule' : {
        'deps' :['angular', 'elasticsearch','esClient']   
    },
    
    'esClient' : {
        'deps' :['angular', 'elasticsearch']   
    }
    
}

});

require(['app'], function(){

angular.bootstrap(document, ['app']);
});

esClient.js

define(function(){

var esClient=angular.module('esClient', ['elasticsearch']);

esClient.service('client', function (esFactory) {
	return esFactory({
		host: 'http://localhost:9200',
		apiVersion: '1.5',
		log: 'trace'
	});
});

});

But it is throwing the following errors. Anyone else faced this issue?

Uncaught TypeError: _.extend is not a function

40.__browserify_Buffer @ elasticsearch.angular.js:38901

s @ elasticsearch.angular.js:4

(anonymous function) @ elasticsearch.angular.js:4

24.../connection @ elasticsearch.angular.js:37262

s @ elasticsearch.angular.js:4

(anonymous function) @ elasticsearch.angular.js:4

15../lib/client @ elasticsearch.angular.js:18307

s @ elasticsearch.angular.js:4

e @ elasticsearch.angular.js:4

(anonymous function) @ elasticsearch.angular.js:4

Uncaught Error: [$injector:modulerr] Failed to instantiate module app due
to:

Error: [$injector:modulerr] Failed to instantiate module coreModule due to:

Error: [$injector:modulerr] Failed to instantiate module esClient due to:

Error: [$injector:modulerr] Failed to instantiate module elasticsearch due
to:

Error: [$injector:nomod] Module 'elasticsearch' is not available! You
either misspelled the module name or forgot to load it. If registering a
module ensure that you specify the dependencies as the second argument.

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