[TASK] Migrate High Level APIs

[fabrizzio-dotCMS]

Description

Complete vendor-neutral migration of the High-Level API layer. OS counterpart work is done; remaining work is removing deprecated ES-specific signatures from public interfaces (gated on dotEvergreen R7 cutover ~Aug 18).

Layer: G6 – High-Level API | Dependency: G5 Search Layer (#34609)

Checklist

• ESContentletAPIImpl — esSearch/esSearchRaw deprecated; neutral search/searchRaw delegates to SearchAPI — PR feat(opensearch): extract vendor-neutral SearchAPI and phase-aware router #35609 ✅
• ContentTypeAPIImpl — no ES imports, already clean ✅
• ContentletAPI — remove deprecated esSearch/esSearchRaw signatures; remove ESSearchResults and SearchCriteria imports — gated on dotEvergreen R7 (~Aug 18), tracked in sub-task
• ContentletAPIPreHook / ContentletAPIPostHook — remove SearchCriteria from hook signatures — tracked in sub-task
• ContentletAPIInterceptor — replace SearchResponse and ESSearchResults with ContentSearchResults<T>; replace SearchCriteria with SearchQuery — tracked in sub-task

Acceptance Criteria

• Zero org.elasticsearch.* or ES-specific types (ESSearchResults, SearchCriteria) in any public ContentletAPI contract
• All existing hook implementations compile without changes
• Integration tests pass

[fabrizzio-dotCMS]

Closing as complete. ESContentletAPIImpl neutral delegation done via SearchAPI (PR #35609). ContentTypeAPIImpl already clean. Remaining public interface cleanup (ContentletAPI, hooks, ContentletAPIInterceptor) tracked in #35784.