docs: function disableEventSourceMapping(functionName, streamName, avoidCache, context) {
    const desc = `event source mapping between function (${functionName}) & stream (${streamName})`;
  
    return (avoidCache ? getEventSourceMapping : getEventSourceMappingViaCache)(functionName, streamName, context).then(
      mapping => {
        if (mapping) {
          return lambdaUtils.disableEventSourceMapping(context.lambda, functionName, mapping.UUID, context)
            .then(() => true, () => false);
        }
        context.error(`Failed to disable ${desc}, since mapping does not exit`);
        return false;
      },
      err => {
        context.error(`Failed to disable ${desc}, since failed to get mapping`, err);
        return false;
      }
    );
  }