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<div class="titlepage"><div><div>
<h2 class="title"><a id="_empty_search"></a>Empty Search<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch-definitive-guide/edit/2.x/054_Query_DSL/55_Request_body_search.asciidoc">edit</a></h2>
</div></div></div>
<p>Let’s start with the simplest form of the <code class="literal">search</code> API, the empty search,
which returns all documents in all indices:</p>
<div class="pre_wrapper lang-sense">
<pre class="programlisting prettyprint lang-sense">GET /_search
{} <a id="CO22-1"></a><i class="conum" data-value="1"></i></pre>
</div>
<div class="sense_widget" data-snippet="snippets/054_Query_DSL/60_Empty_query.json"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO22-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>This is an empty request body.</p>
</td>
</tr>
</table>
</div>
<p>Just as with a query-string search, you can search on one, many, or <code class="literal">_all</code>
indices, and one, many, or all types:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">GET /index_2014*/type1,type2/_search
{}</pre>
</div>
<p>And you can use the <code class="literal">from</code> and <code class="literal">size</code> parameters for pagination:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">GET /_search
{
"from": 30,
"size": 10
}</pre>
</div>
<div class="sidebar">
<a id="get_vs_post"></a>
<div class="titlepage"><div><div>
<p class="title"><strong>A GET Request with a Body?</strong></p>
</div></div></div>
<p>The HTTP libraries of certain languages (notably JavaScript) don’t allow <code class="literal">GET</code>
requests to have a request body. In fact, some users are suprised that <code class="literal">GET</code>
requests are ever allowed to have a body.</p>
<p>The truth is that <a href="http://tools.ietf.org/html/rfc7231#page-24" class="ulink" target="_top">RFC 7231</a>—the
RFC that deals with HTTP semantics and content—​does not define what should
happen to a <code class="literal">GET</code> request with a body! As a result, some HTTP servers allow
it, and some—​especially caching proxies—​don’t.</p>
<p>The authors of Elasticsearch prefer using <code class="literal">GET</code> for a search request because
they feel that it describes the action—​retrieving information—​better
than the <code class="literal">POST</code> verb. However, because <code class="literal">GET</code> with a request body is not
universally supported, the <code class="literal">search</code> API also accepts <code class="literal">POST</code> requests:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">POST /_search
{
"from": 30,
"size": 10
}</pre>
</div>
<p>The same rule applies to any other <code class="literal">GET</code> API that requires a request body.</p>
</div>
<p>We present aggregations in depth in <a class="xref" href="aggregations.html" title="Aggregations">Aggregations</a>, but for now,
we’re going to focus just on the query.</p>
<p>Instead of the cryptic query-string approach, a request body search allows us
to write queries by using the <em>query domain-specific language</em>, or query DSL.
</p>
</div>
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