Elastic search - search_after parameter : <p>I read this <a href="https://www.elastic.co/guide/en/elasticsearch/reference/5.0/search-request-search-after.html" rel="noreferrer">doc</a> to understand 'search_after' and have two question.</p>

<ol>
<li>I'm curious that where "tweet#654323" comes from. Is this one of
document id or field data? </li>
<li><p>When I added multiple parameter of search_after, Is that 'and'
    condition or 'or' condition?</p>

<p>ex) "search_after": [1463538857, 5147821]</p></li>
</ol>
