SOLR-13842: remove redundant defaults from implictPlugins

* From 7.0, wt=json is the default and indent=true is the
  default. So, remove them from implicitPlugin defaults

solr/CHANGES.txt

@@ -107,6 +107,8 @@ Other Changes
 
 * SOLR-12353: SolrDispatchFilter expensive non-conditional debug line degrades performance (Pascal Proulx via Erick Erickson)
 
+* SOLR-13842: Remove redundant defaults from ImplicitPlugins.json (Munendra S N)
+
 ==================  8.5.0 ==================
 
 Consult the LUCENE_CHANGES.txt file for additional, low level, changes in this release.

solr/core/src/resources/ImplicitPlugins.json

@@ -47,9 +47,7 @@
       "class": "solr.RealTimeGetHandler",
       "useParams":"_GET",
       "defaults": {
-        "omitHeader": true,
-        "wt": "json",
-        "indent": true
+        "omitHeader": true
       }
     },
     "/admin/ping": {
@@ -105,9 +103,6 @@
       "components": [
         "query"
       ],
-      "defaults": {
-        "wt": "json"
-      },
       "invariants": {
         "rq": "{!xport}",
         "distrib": false
@@ -124,9 +119,6 @@
     "/stream": {
       "class": "solr.StreamHandler",
       "useParams":"_STREAM",
-      "defaults": {
-        "wt": "json"
-      },
       "invariants": {
         "distrib": false
       }
@@ -134,9 +126,6 @@
     "/sql": {
       "class": "solr.SQLHandler",
       "useParams":"_SQL",
-      "defaults": {
-        "wt": "json"
-      },
       "invariants": {
         "distrib": false
       }