[ML] File upload: Increasing timeout for upload request (elastic#191770)

When uploading a PDF file with a semantic text field, the bulk ingest
request to elasticsearch can sometimes take longer than the default
timeout. This causes the browser to attempt the upload again, resulting
in duplicate documents.
This change increases the timeout to 1 hour which should be more than
enough time for the processor to complete given the max file sizes we
support.

x-pack/plugins/file_upload/server/import_data.ts

@@ -122,7 +122,10 @@ export function importDataProvider({ asCurrentUser }: IScopedClusterClient) {
         bulkRequest.pipeline = pipelineId;
       }
 
-      const resp = await asCurrentUser.bulk(bulkRequest, { maxRetries: 0 });
+      const resp = await asCurrentUser.bulk(bulkRequest, {
+        maxRetries: 0,
+        requestTimeout: 3600000,
+      });
       if (resp.errors) {
         throw resp;
       } else {