How to align element to bottom in a Bootstrap column?

.row {
  background: red;
}

.col-6-md {
  background: lightblue;
  height: 200px;
  display: flex;
}

.bottom {
  background: green;
  align-self: flex-end;
  width: 100px;
  height: 50px;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<div class="row">
  <div class="col-6-md">
    <div class="bottom">Bottom</div>
  </div>
</div>

.bottomdiv {
    border: 1px solid red;
    height: 50px;
    width: 50px;
    position:absolute;
    left:0;
    bottom:0;
}
.col-md-6.col-sm-6.col-xs-6 {
    display: table-cell;
    height: auto;
    border: 1px solid black;
    float: none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
    <div class="row">
       <div class="parent">
        <div class="col-md-6 col-sm-6 col-xs-6">
             <div class="bottomdiv">
             </div>             
        </div>
        <div class="col-md-6 col-sm-6 col-xs-6">
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        </div>
    </div>
</div></div>