Els Service: get Artists

dashboard/src/app/els.service.ts

@@ -277,6 +277,39 @@ export class ElsService {
       .map((hits: Array<any>) => this.hitsToBuckets(hits));
   }
 
+  getArtists(): Observable<Bucket[]> {
+    return this.http
+      .post(this.elsUrl + 'artist' + ElsService.ACTION_SEARCH,
+            JSON.stringify({
+              'size': 100,
+              '_source': [
+                'Artist',
+                'Track Count'
+              ],
+              'sort': [
+                {
+                  'Track Count': {
+                    'order': 'desc'
+                  }
+                }
+              ]
+          }), {headers: this.headers})
+      .map(res => {
+        return res.json().hits.hits;
+      })
+      .map((hits: Array<any>) => {
+        const result: Array<Bucket> = [];
+        hits.forEach((hit) => {
+          const bucket = new Bucket;
+          bucket.doc_count = hit._source['Track Count'];
+          bucket.key = hit._source.Artist;
+          result.push(bucket);
+        });
+        console.log(result);
+        return result;
+      });
+  }
+
   getGenreCount(): Observable<number> {
     return this.http
       .post(this.elsUrl + 'song' + ElsService.ACTION_SEARCH,