Disallow importing Joi client side (#55018)

* Disallow importing Joi client side

* Move elasticsearch lib into server folder

* Add a comment about the 'joi' eslint rule

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

.eslintrc.js

@@ -262,6 +262,8 @@ module.exports = {
                   'src/core/server/**/*',
                   '(src|x-pack)/plugins/*/server/**/*',
                   'examples/**/server/**/*',
+                  // TODO: Remove the 'joi' eslint rule once IE11 support is dropped
+                  'joi',
                 ],
                 errorMessage:
                   'Server modules cannot be imported into client modules or shared modules.',

src/legacy/core_plugins/elasticsearch/index.js

@@ -17,10 +17,10 @@
  * under the License.
  */
 import { first } from 'rxjs/operators';
-import healthCheck from './lib/health_check';
-import { Cluster } from './lib/cluster';
-import { createProxy } from './lib/create_proxy';
-import { handleESError } from './lib/handle_es_error';
+import healthCheck from './server/lib/health_check';
+import { Cluster } from './server/lib/cluster';
+import { createProxy } from './server/lib/create_proxy';
+import { handleESError } from './server/lib/handle_es_error';
 
 export default function(kibana) {
   let defaultVars;

src/legacy/core_plugins/elasticsearch/server/lib/kibana_version.js

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-import { version as kibanaVersion } from '../../../../../package.json';
+import { version as kibanaVersion } from '../../../../../../package.json';
 
 export default {
   // Make the version stubbable to improve testability.