feat: add React Query hooks for admin infrastructure endpoints

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/queries/admin/opensearch.ts

@@ -0,0 +1,102 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import { adminFetch } from './admin-api';
+
+export interface OpenSearchStatus {
+  connected: boolean;
+  clusterName: string;
+  clusterHealth: string;
+  version: string;
+  numberOfNodes: number;
+  host: string;
+}
+
+export interface PipelineStats {
+  queueDepth: number;
+  maxQueueSize: number;
+  totalIndexed: number;
+  totalFailed: number;
+  avgLatencyMs: number;
+}
+
+export interface IndexInfo {
+  name: string;
+  health: string;
+  status: string;
+  docsCount: number;
+  storeSize: string;
+  primaryShards: number;
+  replicas: number;
+}
+
+export interface PerformanceStats {
+  queryCacheHitRate: number;
+  requestCacheHitRate: number;
+  avgQueryLatencyMs: number;
+  avgIndexLatencyMs: number;
+  jvmHeapUsedPercent: number;
+  jvmHeapUsedBytes: number;
+  jvmHeapMaxBytes: number;
+}
+
+export interface IndicesParams {
+  search?: string;
+  health?: string;
+  sortBy?: string;
+  sortDir?: 'asc' | 'desc';
+  page?: number;
+  size?: number;
+}
+
+export function useOpenSearchStatus() {
+  return useQuery({
+    queryKey: ['admin', 'opensearch', 'status'],
+    queryFn: () => adminFetch<OpenSearchStatus>('/opensearch/status'),
+  });
+}
+
+export function usePipelineStats() {
+  return useQuery({
+    queryKey: ['admin', 'opensearch', 'pipeline'],
+    queryFn: () => adminFetch<PipelineStats>('/opensearch/pipeline'),
+    refetchInterval: 15000,
+  });
+}
+
+export function useIndices(params: IndicesParams) {
+  const query = new URLSearchParams();
+  if (params.search) query.set('search', params.search);
+  if (params.health) query.set('health', params.health);
+  if (params.sortBy) query.set('sortBy', params.sortBy);
+  if (params.sortDir) query.set('sortDir', params.sortDir);
+  if (params.page !== undefined) query.set('page', String(params.page));
+  if (params.size !== undefined) query.set('size', String(params.size));
+  const qs = query.toString();
+
+  return useQuery({
+    queryKey: ['admin', 'opensearch', 'indices', params],
+    queryFn: () =>
+      adminFetch<{ indices: IndexInfo[]; total: number }>(
+        `/opensearch/indices${qs ? `?${qs}` : ''}`,
+      ),
+  });
+}
+
+export function usePerformanceStats() {
+  return useQuery({
+    queryKey: ['admin', 'opensearch', 'performance'],
+    queryFn: () => adminFetch<PerformanceStats>('/opensearch/performance'),
+    refetchInterval: 15000,
+  });
+}
+
+export function useDeleteIndex() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: async (indexName: string) => {
+      await adminFetch<void>(`/opensearch/indices/${encodeURIComponent(indexName)}`, {
+        method: 'DELETE',
+      });
+    },
+    onSuccess: () => qc.invalidateQueries({ queryKey: ['admin', 'opensearch', 'indices'] }),
+  });
+}