diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 58d7f9f4bc..956908f5c9 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -105018,6 +105018,11 @@
                   }
                 ]
               },
+              "media_type": {
+                "description": "The media type for encoding `value`.\nApplies only when value is a template snippet.\nMust be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.",
+                "default": "\"application/json\"",
+                "type": "string"
+              },
               "copy_from": {
                 "description": "The origin field which will be appended to `field`, cannot set `value` simultaneously.",
                 "allOf": [
@@ -106922,6 +106927,7 @@
               },
               "media_type": {
                 "description": "The media type for encoding `value`.\nApplies only when value is a template snippet.\nMust be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.",
+                "default": "\"application/json\"",
                 "type": "string"
               },
               "override": {
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index 542f5946ea..b9f4361cb5 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -69001,6 +69001,11 @@
                   }
                 ]
               },
+              "media_type": {
+                "description": "The media type for encoding `value`.\nApplies only when value is a template snippet.\nMust be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.",
+                "default": "\"application/json\"",
+                "type": "string"
+              },
               "copy_from": {
                 "description": "The origin field which will be appended to `field`, cannot set `value` simultaneously.",
                 "allOf": [
@@ -70905,6 +70910,7 @@
               },
               "media_type": {
                 "description": "The media type for encoding `value`.\nApplies only when value is a template snippet.\nMust be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.",
+                "default": "\"application/json\"",
                 "type": "string"
               },
               "override": {
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 16d6faf090..cd3196089e 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -183886,6 +183886,19 @@
             ]
           }
         },
+        {
+          "description": "The media type for encoding `value`.\nApplies only when value is a template snippet.\nMust be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.",
+          "name": "media_type",
+          "required": false,
+          "serverDefault": "\"application/json\"",
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
         {
           "description": "The origin field which will be appended to `field`, cannot set `value` simultaneously.",
           "name": "copy_from",
@@ -183912,7 +183925,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L329-L348"
+      "specLocation": "ingest/_types/Processors.ts#L329-L355"
     },
     {
       "kind": "interface",
@@ -184032,7 +184045,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L350-L391"
+      "specLocation": "ingest/_types/Processors.ts#L357-L398"
     },
     {
       "kind": "interface",
@@ -184086,7 +184099,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L560-L576"
+      "specLocation": "ingest/_types/Processors.ts#L567-L583"
     },
     {
       "kind": "interface",
@@ -184163,7 +184176,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L578-L601"
+      "specLocation": "ingest/_types/Processors.ts#L585-L608"
     },
     {
       "kind": "interface",
@@ -184322,7 +184335,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L603-L664"
+      "specLocation": "ingest/_types/Processors.ts#L610-L671"
     },
     {
       "kind": "interface",
@@ -184388,7 +184401,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L677-L697"
+      "specLocation": "ingest/_types/Processors.ts#L684-L704"
     },
     {
       "kind": "enum",
@@ -184422,7 +184435,7 @@
         "name": "ConvertType",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L666-L675"
+      "specLocation": "ingest/_types/Processors.ts#L673-L682"
     },
     {
       "kind": "interface",
@@ -184520,7 +184533,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L699-L732"
+      "specLocation": "ingest/_types/Processors.ts#L706-L739"
     },
     {
       "kind": "interface",
@@ -184745,7 +184758,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L734-L772"
+      "specLocation": "ingest/_types/Processors.ts#L741-L779"
     },
     {
       "kind": "interface",
@@ -184840,7 +184853,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L774-L807"
+      "specLocation": "ingest/_types/Processors.ts#L781-L814"
     },
     {
       "kind": "interface",
@@ -184906,7 +184919,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L809-L828"
+      "specLocation": "ingest/_types/Processors.ts#L816-L835"
     },
     {
       "kind": "interface",
@@ -185141,7 +185154,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L830-L848"
+      "specLocation": "ingest/_types/Processors.ts#L837-L855"
     },
     {
       "kind": "interface",
@@ -185156,7 +185169,7 @@
         "namespace": "ingest._types"
       },
       "properties": [],
-      "specLocation": "ingest/_types/Processors.ts#L850-L850"
+      "specLocation": "ingest/_types/Processors.ts#L857-L857"
     },
     {
       "kind": "interface",
@@ -185260,7 +185273,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L852-L891"
+      "specLocation": "ingest/_types/Processors.ts#L859-L898"
     },
     {
       "kind": "interface",
@@ -185288,7 +185301,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L893-L899"
+      "specLocation": "ingest/_types/Processors.ts#L900-L906"
     },
     {
       "kind": "enum",
@@ -185334,7 +185347,7 @@
         "name": "FingerprintDigest",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L901-L907"
+      "specLocation": "ingest/_types/Processors.ts#L908-L914"
     },
     {
       "kind": "interface",
@@ -185413,7 +185426,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L909-L937"
+      "specLocation": "ingest/_types/Processors.ts#L916-L944"
     },
     {
       "kind": "interface",
@@ -185466,7 +185479,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L939-L953"
+      "specLocation": "ingest/_types/Processors.ts#L946-L960"
     },
     {
       "kind": "interface",
@@ -185593,7 +185606,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L393-L434"
+      "specLocation": "ingest/_types/Processors.ts#L400-L441"
     },
     {
       "kind": "enum",
@@ -185609,7 +185622,7 @@
         "name": "GeoGridTargetFormat",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L442-L445"
+      "specLocation": "ingest/_types/Processors.ts#L449-L452"
     },
     {
       "kind": "enum",
@@ -185628,7 +185641,7 @@
         "name": "GeoGridTileType",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L436-L440"
+      "specLocation": "ingest/_types/Processors.ts#L443-L447"
     },
     {
       "kind": "interface",
@@ -185735,7 +185748,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L447-L481"
+      "specLocation": "ingest/_types/Processors.ts#L454-L488"
     },
     {
       "kind": "interface",
@@ -185840,7 +185853,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L955-L986"
+      "specLocation": "ingest/_types/Processors.ts#L962-L993"
     },
     {
       "kind": "interface",
@@ -185918,7 +185931,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L988-L1012"
+      "specLocation": "ingest/_types/Processors.ts#L995-L1019"
     },
     {
       "kind": "interface",
@@ -185972,7 +185985,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1014-L1030"
+      "specLocation": "ingest/_types/Processors.ts#L1021-L1037"
     },
     {
       "kind": "interface",
@@ -186006,7 +186019,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1071-L1083",
+      "specLocation": "ingest/_types/Processors.ts#L1078-L1090",
       "variants": {
         "kind": "container"
       }
@@ -186083,7 +186096,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1098-L1124"
+      "specLocation": "ingest/_types/Processors.ts#L1105-L1131"
     },
     {
       "kind": "interface",
@@ -186119,7 +186132,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1085-L1096"
+      "specLocation": "ingest/_types/Processors.ts#L1092-L1103"
     },
     {
       "kind": "interface",
@@ -186230,7 +186243,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1032-L1064"
+      "specLocation": "ingest/_types/Processors.ts#L1039-L1071"
     },
     {
       "kind": "interface",
@@ -186311,7 +186324,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1066-L1069"
+      "specLocation": "ingest/_types/Processors.ts#L1073-L1076"
     },
     {
       "kind": "interface",
@@ -186418,7 +186431,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L483-L517"
+      "specLocation": "ingest/_types/Processors.ts#L490-L524"
     },
     {
       "kind": "interface",
@@ -186480,7 +186493,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1126-L1141"
+      "specLocation": "ingest/_types/Processors.ts#L1133-L1148"
     },
     {
       "kind": "interface",
@@ -186559,7 +186572,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1143-L1172"
+      "specLocation": "ingest/_types/Processors.ts#L1150-L1179"
     },
     {
       "kind": "enum",
@@ -186577,7 +186590,7 @@
         "name": "JsonProcessorConflictStrategy",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L1174-L1179"
+      "specLocation": "ingest/_types/Processors.ts#L1181-L1186"
     },
     {
       "kind": "interface",
@@ -186734,7 +186747,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1181-L1233"
+      "specLocation": "ingest/_types/Processors.ts#L1188-L1240"
     },
     {
       "kind": "interface",
@@ -186809,7 +186822,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1235-L1251"
+      "specLocation": "ingest/_types/Processors.ts#L1242-L1258"
     },
     {
       "kind": "interface",
@@ -186925,7 +186938,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1253-L1287"
+      "specLocation": "ingest/_types/Processors.ts#L1260-L1294"
     },
     {
       "kind": "interface",
@@ -187213,7 +187226,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1289-L1300"
+      "specLocation": "ingest/_types/Processors.ts#L1296-L1307"
     },
     {
       "kind": "interface",
@@ -188196,7 +188209,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1302-L1343"
+      "specLocation": "ingest/_types/Processors.ts#L1309-L1350"
     },
     {
       "kind": "interface",
@@ -188249,7 +188262,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1345-L1361"
+      "specLocation": "ingest/_types/Processors.ts#L1352-L1368"
     },
     {
       "kind": "interface",
@@ -188302,7 +188315,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1363-L1377"
+      "specLocation": "ingest/_types/Processors.ts#L1370-L1384"
     },
     {
       "kind": "interface",
@@ -188355,7 +188368,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1379-L1395"
+      "specLocation": "ingest/_types/Processors.ts#L1386-L1402"
     },
     {
       "kind": "interface",
@@ -188437,7 +188450,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1397-L1425"
+      "specLocation": "ingest/_types/Processors.ts#L1404-L1432"
     },
     {
       "kind": "interface",
@@ -188509,7 +188522,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1427-L1447"
+      "specLocation": "ingest/_types/Processors.ts#L1434-L1454"
     },
     {
       "kind": "interface",
@@ -188565,6 +188578,7 @@
           "description": "The media type for encoding `value`.\nApplies only when value is a template snippet.\nMust be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.",
           "name": "media_type",
           "required": false,
+          "serverDefault": "\"application/json\"",
           "type": {
             "kind": "instance_of",
             "type": {
@@ -188595,7 +188609,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1449-L1483"
+      "specLocation": "ingest/_types/Processors.ts#L1456-L1491"
     },
     {
       "kind": "interface",
@@ -188638,7 +188652,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1485-L1494"
+      "specLocation": "ingest/_types/Processors.ts#L1493-L1502"
     },
     {
       "kind": "enum",
@@ -188654,7 +188668,7 @@
         "name": "ShapeType",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L1496-L1499"
+      "specLocation": "ingest/_types/Processors.ts#L1504-L1507"
     },
     {
       "kind": "interface",
@@ -188753,7 +188767,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1501-L1517"
+      "specLocation": "ingest/_types/Processors.ts#L1509-L1525"
     },
     {
       "kind": "interface",
@@ -188832,7 +188846,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1519-L1544"
+      "specLocation": "ingest/_types/Processors.ts#L1527-L1552"
     },
     {
       "kind": "interface",
@@ -188847,7 +188861,7 @@
         "namespace": "ingest._types"
       },
       "properties": [],
-      "specLocation": "ingest/_types/Processors.ts#L1546-L1546"
+      "specLocation": "ingest/_types/Processors.ts#L1554-L1554"
     },
     {
       "kind": "interface",
@@ -188901,7 +188915,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1548-L1564"
+      "specLocation": "ingest/_types/Processors.ts#L1556-L1572"
     },
     {
       "kind": "interface",
@@ -188955,7 +188969,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1566-L1582"
+      "specLocation": "ingest/_types/Processors.ts#L1574-L1590"
     },
     {
       "kind": "interface",
@@ -189035,7 +189049,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1602-L1628"
+      "specLocation": "ingest/_types/Processors.ts#L1610-L1636"
     },
     {
       "kind": "interface",
@@ -189089,7 +189103,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L1584-L1600"
+      "specLocation": "ingest/_types/Processors.ts#L1592-L1608"
     },
     {
       "kind": "interface",
@@ -189197,7 +189211,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Processors.ts#L519-L550"
+      "specLocation": "ingest/_types/Processors.ts#L526-L557"
     },
     {
       "kind": "enum",
@@ -189222,7 +189236,7 @@
         "name": "UserAgentProperty",
         "namespace": "ingest._types"
       },
-      "specLocation": "ingest/_types/Processors.ts#L552-L558"
+      "specLocation": "ingest/_types/Processors.ts#L559-L565"
     },
     {
       "kind": "interface",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index b44ed0fc97..d177bd0e4a 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -15193,6 +15193,7 @@ export type InferenceUpdateResponse = InferenceInferenceEndpointInfo
 export interface IngestAppendProcessor extends IngestProcessorBase {
   field: Field
   value?: any | any[]
+  media_type?: string
   copy_from?: Field
   allow_duplicates?: boolean
 }
diff --git a/specification/ingest/_types/Processors.ts b/specification/ingest/_types/Processors.ts
index 9c4d375d25..9da4669e8c 100644
--- a/specification/ingest/_types/Processors.ts
+++ b/specification/ingest/_types/Processors.ts
@@ -336,6 +336,13 @@ export class AppendProcessor extends ProcessorBase {
    * The value to be appended. Supports template snippets. May specify only one of `value` or `copy_from`.
    */
   value?: UserDefinedValue | UserDefinedValue[]
+  /**
+   * The media type for encoding `value`.
+   * Applies only when value is a template snippet.
+   * Must be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.
+   * @server_default "application/json"
+   */
+  media_type?: string
   /**
    * The origin field which will be appended to `field`, cannot set `value` simultaneously.
    */
@@ -1466,6 +1473,7 @@ export class SetProcessor extends ProcessorBase {
    * The media type for encoding `value`.
    * Applies only when value is a template snippet.
    * Must be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.
+   * @server_default "application/json"
    */
   media_type?: string
   /**