code: @GET
      @Path("/bulk")
      @Consumes(Servlets.JSON_MEDIA_TYPE)
      @Produces(Servlets.JSON_MEDIA_TYPE)
      public AtlasEntitiesWithExtInfo getByGuids(@QueryParam("guid") List<String> guids) throws AtlasBaseException {
          AtlasPerfTracer perf = null;
  
          try {
              if (AtlasPerfTracer.isPerfTraceEnabled(PERF_LOG)) {
                  perf = AtlasPerfTracer.getPerfTracer(PERF_LOG, "EntityREST.getByGuids(" + guids + ")");
              }
  
              if (CollectionUtils.isEmpty(guids)) {
                  throw new AtlasBaseException(AtlasErrorCode.INSTANCE_GUID_NOT_FOUND, guids);
              }
  
              return entitiesStore.getByIds(guids);
          } finally {
              AtlasPerfTracer.log(perf);
          }
      }
docs: Bulk API to retrieve list of entities identified by its GUIDs.