Amend index API spec

The endpoints that accept an id can be called with either PUT or POST.
The endpoints that don't accept an id can only be called with POST.

Author: javanna

rest-api-spec/src/main/resources/rest-api-spec/api/index.json

@@ -10,6 +10,7 @@
         {
           "path":"/{index}/_doc/{id}",
           "methods":[
+            "POST",
             "PUT"
           ],
           "parts":{
@@ -26,8 +27,7 @@
         {
           "path":"/{index}/_doc",
           "methods":[
-            "POST",
-            "PUT"
+            "POST"
           ],
           "parts":{
             "index":{
@@ -39,8 +39,7 @@
         {
           "path":"/{index}/{type}",
           "methods":[
-            "POST",
-            "PUT"
+            "POST"
           ],
           "parts":{
             "index":{
@@ -61,6 +60,7 @@
         {
           "path":"/{index}/{type}/{id}",
           "methods":[
+            "POST",
             "PUT"
           ],
           "parts":{