[DOCS] Simplify index template snippets for data streams (#59533) (#59553)

Removes the `@timestamp` field mapping from several data stream index
template snippets.

With #59317, the `@timestamp` field defaults to a `date` field data type
for data streams.

docs/reference/data-streams/change-mappings-and-settings.asciidoc

@@ -52,31 +52,13 @@ PUT /_ilm/policy/logs_policy
 PUT /_index_template/logs_data_stream
 {
   "index_patterns": [ "logs*" ],
-  "data_stream": {},
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  }
+  "data_stream": { }
 }
 
 PUT /_index_template/new_logs_data_stream
 {
   "index_patterns": [ "new_logs*" ],
-  "data_stream": {},
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  }
+  "data_stream": { }
 }
 
 PUT /_data_stream/logs
@@ -124,9 +106,6 @@ PUT /_index_template/logs_data_stream
   "template": {
     "mappings": {
       "properties": {
-        "@timestamp": {
-          "type": "date"
-        },
         "message": {                              <1>
           "type": "text"
         }
@@ -191,9 +170,6 @@ PUT /_index_template/logs_data_stream
   "template": {
     "mappings": {
       "properties": {
-        "@timestamp": {
-          "type": "date"
-        },
         "host": {
           "properties": {
             "ip": {
@@ -273,13 +249,6 @@ PUT /_index_template/logs_data_stream
   "index_patterns": [ "logs*" ],
   "data_stream": { },
   "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    },
     "settings": {
       "index.refresh_interval": "30s"             <1>
     }
@@ -337,13 +306,6 @@ PUT /_index_template/logs_data_stream
   "index_patterns": [ "logs*" ],
   "data_stream": { },
   "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    },
     "settings": {
       "sort.field": [ "@timestamp"],             <1>
       "sort.order": [ "desc"]                    <2>

docs/reference/data-streams/use-a-data-stream.asciidoc

@@ -19,16 +19,7 @@ the following:
 PUT /_index_template/logs_data_stream
 {
   "index_patterns": [ "logs*" ],
-  "data_stream": {},
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  }
+  "data_stream": { }
 }
 
 PUT /_data_stream/logs

docs/reference/ilm/ilm-tutorial.asciidoc

@@ -127,13 +127,6 @@ PUT _index_template/timeseries_template
       "number_of_shards": 1,
       "number_of_replicas": 1,
       "index.lifecycle.name": "timeseries_policy"     <2>
-    },
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"                              <3>
-        }
-      }
     }
   }
 }
@@ -142,8 +135,6 @@ PUT _index_template/timeseries_template
 
 <1> Apply the template when a document is indexed into the `timeseries` target.
 <2> The name of the {ilm-init} policy used to manage the data stream.
-<3> A <<date,`date`>> or <<date_nanos,`date_nanos`>> field mapping for the
-"@timestamp" field the data stream will use.
 ====
 
 [discrete]

docs/reference/indices/create-data-stream.asciidoc

@@ -16,15 +16,6 @@ See <<set-up-a-data-stream>>.
 PUT /_index_template/template
 {
   "index_patterns": ["my-data-stream*"],
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  },
   "data_stream": { }
 }
 ----

docs/reference/indices/delete-data-stream.asciidoc

@@ -14,15 +14,6 @@ indices. See <<delete-a-data-stream>>.
 PUT /_index_template/template
 {
   "index_patterns": ["my-data-stream*"],
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  },
   "data_stream": { }
 }
 

docs/reference/indices/get-data-stream.asciidoc

@@ -37,13 +37,6 @@ PUT /_index_template/my-index-template
   "index_patterns": [ "my-data-stream*" ],
   "data_stream": {},
   "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    },
     "settings": {
       "index.lifecycle.name": "my-lifecycle-policy"
     }

docs/reference/indices/resolve.asciidoc

@@ -30,16 +30,7 @@ PUT /my-index/_alias/f-alias
 PUT /_index_template/foo_data_stream
 {
   "index_patterns": [ "foo" ],
-  "data_stream": {},
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  }
+  "data_stream": { }
 }
 
 PUT /_data_stream/foo

docs/reference/indices/rollover-index.asciidoc

@@ -232,15 +232,6 @@ The API returns the following response:
 PUT _index_template/template
 {
   "index_patterns": ["my-data-stream*"],
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  },
   "data_stream": { }
 }
 -----------------------------------

x-pack/docs/en/security/authorization/alias-privileges.asciidoc

@@ -43,16 +43,7 @@ backing indices, the user can retrieve a document directly from `.ds-logs-000002
 PUT /_index_template/logs_data_stream
 {
   "index_patterns": [ "logs*" ],
-  "data_stream": {},
-  "template": {
-    "mappings": {
-      "properties": {
-        "@timestamp": {
-          "type": "date"
-        }
-      }
-    }
-  }
+  "data_stream": { }
 }
 
 PUT /_data_stream/logs