code: @GET
      @Path("/uniqueAttribute/type/{typeName}")
      @Consumes(Servlets.JSON_MEDIA_TYPE)
      @Produces(Servlets.JSON_MEDIA_TYPE)
      public AtlasEntityWithExtInfo getByUniqueAttributes(@PathParam("typeName") String typeName,
                                                          @Context HttpServletRequest servletRequest) throws AtlasBaseException {
          AtlasPerfTracer perf = null;
  
          try {
              Map<String, Object> attributes = getAttributes(servletRequest);
  
              if (AtlasPerfTracer.isPerfTraceEnabled(PERF_LOG)) {
                  perf = AtlasPerfTracer.getPerfTracer(PERF_LOG, "EntityREST.getByUniqueAttributes(" + typeName + "," + attributes + ")");
              }
  
              AtlasEntityType entityType = ensureEntityType(typeName);
  
              validateUniqueAttribute(entityType, attributes);
  
              return entitiesStore.getByUniqueAttributes(entityType, attributes);
          } finally {
              AtlasPerfTracer.log(perf);
          }
      }
docs: Fetch complete definition of an entity given its type and unique attribute.
  @param typeName
  @return AtlasEntityWithExtInfo
  @throws AtlasBaseException