[Docs] Correct README example snippet (#45133)

The example tries to create a new index but the create index API requires the
"settings" parameter to be there.

Closes #45129

README.textile

@@ -150,14 +150,14 @@ curl -XPUT 'http://localhost:9200/kimchy/_doc/2?pretty' -H 'Content-Type: applic
 
 The above will index information into the @kimchy@ index. Each user will get their own special index.
 
-Complete control on the index level is allowed. As an example, in the above case, we would want to change from the default 5 shards with 1 replica per index, to only 1 shard with 1 replica per index (== per twitter user). Here is how this can be done (the configuration can be in yaml as well):
+Complete control on the index level is allowed. As an example, in the above case, we might want to change from the default 1 shards with 1 replica per index, to 2 shards with 1 replica per index (because this user tweets a lot). Here is how this can be done (the configuration can be in yaml as well):
 
 <pre>
 curl -XPUT http://localhost:9200/another_user?pretty -H 'Content-Type: application/json' -d '
 {
-    "index" : {
-        "number_of_shards" : 1,
-        "number_of_replicas" : 1
+    "settings" : {
+        "index.number_of_shards" : 2,
+        "index.number_of_replicas" : 1
     }
 }'
 </pre>