🌊 Show detected field types for classic streams enrichment (#222579)

Adds "detected fields" tab for classic streams enrichment editor

<img width="1005" alt="Screenshot 2025-06-04 at 17 58 57"
src="https://github.com/user-attachments/assets/3f3bc959-a27d-4e53-af96-153f0cd0fb54"
/>

This PR adds the "detected fields" tab for classic streams by fetching
the actual Elasticsearch field type from field caps and showing it along
with the detected fields. This currently doesn't work for fields that
are not mapped yet but would get added as part of the simulation
(Elasticsearch feature request here:
https://github.com/elastic/elasticsearch/issues/128760 ).

This adds a new column "Elasticsearch field type" to the schema editor
table. For wired streams, this column is not relevant at all, but it can
be helpful for classic streams to highlight the non-managed parts.

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

x-pack/platform/plugins/shared/streams/server/routes/internal/streams/processing/simulation_handler.ts

@@ -18,6 +18,7 @@ import {
   IndicesIndexState,
   SimulateIngestResponse,
   SimulateIngestSimulateIngestDocumentResult,
+  FieldCapsResponse,
 } from '@elastic/elasticsearch/lib/api/types';
 import { IScopedClusterClient } from '@kbn/core/server';
 import { flattenObjectNestedLast, calculateObjectDiff } from '@kbn/object-utils';
@@ -138,10 +139,10 @@ export type IngestSimulationResult =
     };
 
 export type DetectedField =
-  | WithName
+  | WithNameAndEsType
-  | WithName<FieldDefinitionConfig | InheritedFieldDefinitionConfig>;
+  | WithNameAndEsType<FieldDefinitionConfig | InheritedFieldDefinitionConfig>;
 
-export type WithName<TObj = {}> = TObj & { name: string };
+export type WithNameAndEsType<TObj = {}> = TObj & { name: string; esType?: string };
 export type WithRequired<TObj, TKey extends keyof TObj> = TObj & { [TProp in TKey]-?: TObj[TProp] };
 
 export const simulateProcessing = async ({
@@ -150,7 +151,8 @@ export const simulateProcessing = async ({
   streamsClient,
 }: SimulateProcessingDeps) => {
   /* 0. Retrieve required data to prepare the simulation */
-  const [stream, streamIndex] = await Promise.all([
+  const [stream, { indexState: streamIndexState, fieldCaps: streamIndexFieldCaps }] =
+    await Promise.all([
       streamsClient.getStream(params.path.name),
       getStreamIndex(scopedClusterClient, streamsClient, params.path.name),
     ]);
@@ -158,7 +160,11 @@ export const simulateProcessing = async ({
   /* 1. Prepare data for either simulation types (ingest, pipeline), prepare simulation body for the mandatory pipeline simulation */
   const simulationData = prepareSimulationData(params);
   const pipelineSimulationBody = preparePipelineSimulationBody(simulationData);
-  const ingestSimulationBody = prepareIngestSimulationBody(simulationData, streamIndex, params);
+  const ingestSimulationBody = prepareIngestSimulationBody(
+    simulationData,
+    streamIndexState,
+    params
+  );
   /**
    * 2. Run both pipeline and ingest simulations in parallel.
    * - The pipeline simulation is used to extract the documents reports and the processor metrics. This always runs.
@@ -189,7 +195,12 @@ export const simulateProcessing = async ({
   );
 
   /* 5. Extract valid detected fields asserting existing mapped fields from stream and ancestors */
-  const detectedFields = await computeDetectedFields(processorsMetrics, params, streamFields);
+  const detectedFields = await computeDetectedFields(
+    processorsMetrics,
+    params,
+    streamFields,
+    streamIndexFieldCaps
+  );
 
   /* 6. Derive general insights and process final response body */
   return prepareSimulationResponse(docReports, processorsMetrics, detectedFields);
@@ -744,18 +755,30 @@ const getStreamIndex = async (
   scopedClusterClient: IScopedClusterClient,
   streamsClient: StreamsClient,
   streamName: string
-): Promise<IndicesIndexState> => {
+): Promise<{
+  indexState: IndicesIndexState;
+  fieldCaps: FieldCapsResponse['fields'];
+}> => {
   const dataStream = await streamsClient.getDataStream(streamName);
-  const lastIndex = dataStream.indices.at(-1);
+  const lastIndexRef = dataStream.indices.at(-1);
-  if (!lastIndex) {
+  if (!lastIndexRef) {
     throw new Error(`No writing index found for stream ${streamName}`);
   }
 
-  const lastIndexMapping = await scopedClusterClient.asCurrentUser.indices.get({
+  const [lastIndex, lastIndexFieldCaps] = await Promise.all([
-    index: lastIndex.index_name,
+    scopedClusterClient.asCurrentUser.indices.get({
-  });
+      index: lastIndexRef.index_name,
+    }),
+    scopedClusterClient.asCurrentUser.fieldCaps({
+      index: lastIndexRef.index_name,
+      fields: '*',
+    }),
+  ]);
 
-  return lastIndexMapping[lastIndex.index_name];
+  return {
+    indexState: lastIndex[lastIndexRef.index_name],
+    fieldCaps: lastIndexFieldCaps.fields,
+  };
 };
 
 const getStreamFields = async (
@@ -780,7 +803,8 @@ const getStreamFields = async (
 const computeDetectedFields = async (
   processorsMetrics: Record<string, ProcessorMetrics>,
   params: ProcessingSimulationParams,
-  streamFields: FieldDefinition
+  streamFields: FieldDefinition,
+  streamFieldCaps: FieldCapsResponse['fields']
 ): Promise<DetectedField[]> => {
   const fields = Object.values(processorsMetrics).flatMap((metrics) => metrics.detected_fields);
 
@@ -799,7 +823,11 @@ const computeDetectedFields = async (
       return { name, ...existingField };
     }
 
-    return { name, type: confirmedValidDetectedFields[name]?.type };
+    const existingFieldCaps = Object.keys(streamFieldCaps[name] || {});
+
+    const esType = existingFieldCaps.length > 0 ? existingFieldCaps[0] : undefined;
+
+    return { name, type: confirmedValidDetectedFields[name]?.type, esType };
   });
 };
 

x-pack/platform/plugins/shared/streams_app/public/components/data_management/schema_editor/index.tsx

@@ -25,6 +25,7 @@ export function SchemaEditor({
   withControls = false,
   withFieldSimulation = false,
   withTableActions = false,
+  withToolbar = true,
 }: SchemaEditorProps) {
   const [controls, updateControls] = useControls();
 
@@ -50,6 +51,7 @@ export function SchemaEditor({
         )}
         <FieldsTable
           controls={controls}
+          withToolbar={withToolbar}
           defaultColumns={defaultColumns}
           fields={fields}
           stream={stream}

x-pack/platform/plugins/shared/streams_app/public/components/data_management/schema_editor/schema_editor_table.tsx

@@ -13,6 +13,8 @@ import {
   EuiDataGrid,
   EuiDataGridCellProps,
   EuiDataGridControlColumn,
+  EuiIconTip,
+  EuiFlexGroup,
 } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
 import { Streams } from '@kbn/streams-schema';
@@ -31,12 +33,14 @@ export function FieldsTable({
   fields,
   stream,
   withTableActions,
+  withToolbar,
 }: {
   controls: TControls;
   defaultColumns: TableColumnName[];
   fields: SchemaField[];
   stream: Streams.ingest.all.Definition;
   withTableActions: boolean;
+  withToolbar: boolean;
 }) {
   // Column visibility
   const [visibleColumns, setVisibleColumns] = useState<string[]>(defaultColumns);
@@ -75,7 +79,7 @@ export function FieldsTable({
         canDragAndDropColumns: false,
       }}
       sorting={{ columns: sortingColumns, onSort: setSortingColumns }}
-      toolbarVisibility={true}
+      toolbarVisibility={withToolbar}
       rowCount={filteredFields.length}
       renderCellValue={RenderCellValue}
       trailingControlColumns={trailingColumns}
@@ -100,7 +104,26 @@ const createCellRenderer =
     const { parent, status } = field;
 
     if (columnId === 'type') {
-      if (!field.type) return EMPTY_CONTENT;
+      if (!field.type) {
+        if (field.status === 'unmapped' && field.esType) {
+          return (
+            <EuiFlexGroup alignItems="center" gutterSize="xs" responsive={false}>
+              {field.esType}
+              <EuiIconTip
+                content={i18n.translate(
+                  'xpack.streams.streamDetailSchemaEditorFieldsTableTypeEsTypeTooltip',
+                  {
+                    defaultMessage:
+                      'This field is not managed by Streams, but is defined in Elasticsearch. It can be controlled via the underlying index template and component templates available in the "Advanced" tab.',
+                  }
+                )}
+                position="right"
+              />
+            </EuiFlexGroup>
+          );
+        }
+        return EMPTY_CONTENT;
+      }
       return <FieldType type={field.type} aliasFor={field.alias_for} />;
     }
 

x-pack/platform/plugins/shared/streams_app/public/components/data_management/schema_editor/types.ts

@@ -31,6 +31,10 @@ export interface MappedSchemaField extends BaseSchemaField {
 export interface UnmappedSchemaField extends BaseSchemaField {
   status: 'unmapped';
   type?: SchemaFieldType;
+  /**
+   * Elasticsearch-level type of the field - only available for fields of classic streams that are not mapped through streams but from the underlying index.
+   */
+  esType?: string;
   additionalParameters?: FieldDefinitionConfigAdvancedParameters;
 }
 
@@ -47,6 +51,7 @@ export interface SchemaEditorProps {
   withControls?: boolean;
   withFieldSimulation?: boolean;
   withTableActions?: boolean;
+  withToolbar?: boolean;
 }
 
 export const isSchemaFieldTyped = (field: SchemaField): field is MappedSchemaField => {

x-pack/platform/plugins/shared/streams_app/public/components/data_management/stream_detail_enrichment/detected_fields_editor.tsx

@@ -16,7 +16,7 @@ import { SchemaField } from '../schema_editor/types';
 import { useStreamEnrichmentEvents } from './state_management/stream_enrichment_state_machine';
 
 interface DetectedFieldsEditorProps {
-  definition: Streams.WiredStream.GetResponse;
+  definition: Streams.ingest.all.GetResponse;
   detectedFields: SchemaField[];
 }
 
@@ -24,6 +24,7 @@ export const DetectedFieldsEditor = ({ definition, detectedFields }: DetectedFie
   const { euiTheme } = useEuiTheme();
 
   const { mapField, unmapField } = useStreamEnrichmentEvents();
+  const isWiredStream = Streams.WiredStream.GetResponse.is(definition);
 
   const hasFields = detectedFields.length > 0;
 
@@ -49,6 +50,7 @@ export const DetectedFieldsEditor = ({ definition, detectedFields }: DetectedFie
 
   return (
     <>
+      {isWiredStream && (
         <EuiText
           component="p"
           color="subdued"
@@ -59,16 +61,21 @@ export const DetectedFieldsEditor = ({ definition, detectedFields }: DetectedFie
         >
           {i18n.translate(
             'xpack.streams.streamDetailView.managementTab.enrichment.simulationPlayground.detectedFieldsHeadline',
-          { defaultMessage: 'You can review and adjust saved fields further in the Schema Editor.' }
+            {
+              defaultMessage:
+                'You can review and adjust saved fields further in the Schema Editor.',
+            }
           )}
         </EuiText>
+      )}
       <SchemaEditor
-        defaultColumns={['name', 'type', 'format', 'status']}
+        defaultColumns={isWiredStream ? ['name', 'type', 'format', 'status'] : ['name', 'type']}
         fields={detectedFields}
         stream={definition.stream}
         onFieldUnmap={unmapField}
         onFieldUpdate={mapField}
-        withTableActions
+        withTableActions={isWiredStream}
+        withToolbar={isWiredStream}
       />
     </>
   );

x-pack/platform/plugins/shared/streams_app/public/components/data_management/stream_detail_enrichment/simulation_playground.tsx

@@ -15,7 +15,6 @@ import {
   EuiTab,
   EuiTabs,
 } from '@elastic/eui';
-import { Streams } from '@kbn/streams-schema';
 import { ProcessorOutcomePreview } from './processor_outcome_preview';
 import {
   useSimulatorSelector,
@@ -47,7 +46,6 @@ export const SimulationPlayground = () => {
   );
 
   const definition = useStreamsEnrichmentSelector((state) => state.context.definition);
-  const canViewDetectedFields = Streams.WiredStream.GetResponse.is(definition);
 
   return (
     <>
@@ -59,7 +57,6 @@ export const SimulationPlayground = () => {
               { defaultMessage: 'Data preview' }
             )}
           </EuiTab>
-          {canViewDetectedFields && (
           <EuiTab
             isSelected={isViewingDetectedFields}
             onClick={viewSimulationDetectedFields}
@@ -74,13 +71,12 @@ export const SimulationPlayground = () => {
               { defaultMessage: 'Detected fields' }
             )}
           </EuiTab>
-          )}
         </EuiTabs>
         {isLoading && <EuiProgress size="xs" color="accent" position="absolute" />}
       </EuiFlexItem>
       <EuiSpacer size="m" />
       {isViewingDataPreview && <ProcessorOutcomePreview />}
-      {isViewingDetectedFields && canViewDetectedFields && (
+      {isViewingDetectedFields && (
         <DetectedFieldsEditor definition={definition} detectedFields={detectedFields} />
       )}
     </>

x-pack/platform/plugins/shared/streams_app/public/components/data_management/stream_detail_enrichment/state_management/simulation_state_machine/utils.ts

@@ -111,6 +111,7 @@ export function getSchemaFieldsFromSimulation(
     // Detected field still unmapped
     return {
       status: 'unmapped',
+      esType: field.esType,
       name: field.name,
       parent: streamName,
     };