refactor: get index from .env

Services/server/src/controllers/searchController.ts

@@ -11,7 +11,7 @@ export class SearchController extends Controller {
   @SuccessResponse(HttpStatusCode.OK)
   public async searchFile(@Body() search: Search): Promise<EhrFile[]> {
     const result = await esClient.search<EhrFile & { attachment: Record<string, string> }>({
-      index: "ehr-api-client",
+      index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
       query: {
         bool: {
           must: search.AND?.map((v) => ({ match: { [v.field]: v.value } })),