remove Joi validation, add createClient, update tests

src/helpers/create_client.js

@@ -0,0 +1,13 @@
+import elasticsearch from 'elasticsearch';
+
+export default function createClient(options) {
+  let client;
+
+  if (options instanceof elasticsearch.Client) {
+    client = options;
+  } else {
+    client = new elasticsearch.Client(options);
+  }
+
+  return client;
+};

src/helpers/validate_schema.js

@@ -1,17 +0,0 @@
-import Joi from 'joi';
-
-var schema = Joi.object({
-  url: Joi.string().uri({ scheme: ['http', 'https'] }).default('http://localhost:9200'),
-  index: Joi.string().required(),
-  interval: Joi.string().default('1w'),
-  timeout: Joi.number().min(10000).default(10000),
-}).default();
-
-const validateSchema = (options) => new Promise(function (resolve, reject) {
-  schema.validate(options, (err, settings) => {
-    if (err) return reject(err);
-    resolve(settings);
-  })
-})
-
-export default validateSchema;