(back) Suggester: Change ELS search analyzer for specific char

Implementing search in dashboard revealed problems when search with specific char (francois perusse)
Note: it's also possible to specify an analyzer for ingestion

(cherry picked from commit 24da127750c995c55d54876a1be8a4ad3bf9ce9c)

suggester.es

@@ -30,13 +30,15 @@ PUT /itunes-suggest
     "mappings": {
         "properties": {
             "artist_suggest": {
-                "type": "completion"
+                "type": "completion",
+                "search_analyzer": "names"
             },
             "artist": {
                 "type": "keyword"
             },
             "album_suggest": {
-                "type": "completion"
+                "type": "completion",
+                "search_analyzer": "names"
             },
             "album": {
                 "type": "keyword"
@@ -45,6 +47,8 @@ PUT /itunes-suggest
     }
 }
 
+// Also possible to specify analyze for ingesting => https://stackoverflow.com/questions/48304499/elasticsearch-completion-suggester-not-working-with-whitespace-analyzer
+
 // Problem with word EP, SP
 
 GET itunes-suggest/_analyze
@@ -53,6 +57,8 @@ GET itunes-suggest/_analyze
     "text": "the servent"
 }
 
+GET itunes-suggest/_search
+
 POST itunes-suggest/_search
 {
     "_source" : "artist",
@@ -79,3 +85,53 @@ POST itunes-suggest/_search
         }
     }
 }
+
+POST itunes-suggest/_search
+{
+    "_source": ["album", "artist"],
+    "suggest": {
+        "alb-suggest": {
+            "prefix": "sou",
+            "completion": {
+                "field": "album_suggest"
+            }
+        },
+        "ar-suggest": {
+            "prefix": "sou",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}
+
+POST itunes-suggest/_search
+{
+    "_source": ["album", "artist"],
+    "suggest": {
+        "alb-suggest": {
+            "prefix": "Francois",
+            "completion": {
+                "field": "album_suggest"
+            }
+        },
+        "ar-suggest": {
+            "prefix": "Francois",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}
+
+POST itunes-suggest/_search
+{
+    "suggest": {
+        "ar-suggest": {
+            "prefix": "Femme",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}