Minor doc updates (#9217)

* update string first last aggs

* update kafka ingestion specs in docs

* remove unnecessary parser spec

docs/querying/aggregations.md

@@ -215,8 +215,7 @@ Note that queries with first/last aggregators on a segment created with rollup e
   "type" : "stringFirst",
   "name" : <output_name>,
   "fieldName" : <metric_name>,
-  "maxStringBytes" : <integer> # (optional, defaults to 1024),
-  "filterNullValues" : <boolean> # (optional, defaults to false)
+  "maxStringBytes" : <integer> # (optional, defaults to 1024)
 }
 ```
 
@@ -231,8 +230,7 @@ Note that queries with first/last aggregators on a segment created with rollup e
   "type" : "stringLast",
   "name" : <output_name>,
   "fieldName" : <metric_name>,
-  "maxStringBytes" : <integer> # (optional, defaults to 1024),
-  "filterNullValues" : <boolean> # (optional, defaults to false)
+  "maxStringBytes" : <integer> # (optional, defaults to 1024)
 }
 ```
 

docs/tutorials/tutorial-kafka.md

@@ -183,10 +183,6 @@ Paste in this spec and click `Submit`.
   "spec" : {
     "dataSchema": {
       "dataSource": "wikipedia",
-      "parser": {
-        "type": "string",
-        "parseSpec": {
-          "format": "json",
       "timestampSpec": {
         "column": "time",
         "format": "auto"
@@ -213,8 +209,6 @@ Paste in this spec and click `Submit`.
           { "name": "deleted", "type": "long" },
           { "name": "delta", "type": "long" }
         ]
-          }
-        }
       },
       "metricsSpec" : [],
       "granularitySpec": {
@@ -230,6 +224,9 @@ Paste in this spec and click `Submit`.
     },
     "ioConfig": {
       "topic": "wikipedia",
+      "inputFormat": {
+        "type": "json"
+      },
       "replicas": 2,
       "taskDuration": "PT10M",
       "completionTimeout": "PT20M",

examples/quickstart/tutorial/wikipedia-kafka-supervisor.json

@@ -3,10 +3,6 @@
   "spec" : {
     "dataSchema": {
       "dataSource": "wikipedia",
-      "parser": {
-        "type": "string",
-        "parseSpec": {
-          "format": "json",
       "timestampSpec": {
         "column": "time",
         "format": "auto"
@@ -42,8 +38,6 @@
             "type": "long"
           }
         ]
-          }
-        }
       },
       "metricsSpec": [],
       "granularitySpec": {
@@ -59,6 +53,9 @@
     },
     "ioConfig": {
       "topic": "wikipedia",
+      "inputFormat": {
+        "type": "json"
+      },
       "replicas": 1,
       "taskDuration": "PT10M",
       "completionTimeout": "PT20M",