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zhengxiu 93d856d5c5 css umn 25.6.0 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: zhengxiu <zhengxiu@huawei.com>
Co-committed-by: zhengxiu <zhengxiu@huawei.com>
2025-11-25 11:34:43 +00:00

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<a name="EN-US_TOPIC_0000001945217690"></a><a name="EN-US_TOPIC_0000001945217690"></a>
<h1 class="topictitle1">Accessing an Elasticsearch Cluster Using Go</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_p19485165442813">This section describes how to access a CSS cluster using Go.</p>
<div class="section" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_section177422318132"><h4 class="sectiontitle">Preparations</h4><ul id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_ul294712299581"><li id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_li181191829144220">The CSS cluster is available.</li><li id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_li76751031195813">Ensure that the server running Go can communicate with the CSS cluster.</li><li id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_li551945111016">Ensure that Go has been installed on the server. You can download Go from the official website: https://go.dev/dl/.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_section161662394136"><h4 class="sectiontitle">Connecting to a Non-Security Mode Cluster</h4><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_p1551727708">Connect to a non-security mode cluster. The sample code is as follows:</p>
<div class="codecoloring" codetype="Go" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_screen1957718561373"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="kn">import</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="s">&quot;github.com/elastic/go-elasticsearch/v7&quot;</span>
<span class="w"> </span><span class="s">&quot;log&quot;</span>
<span class="p">)</span>
<span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">cfg</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">Config</span><span class="p">{</span>
<span class="w"> </span><span class="nx">Addresses</span><span class="p">:</span><span class="w"> </span><span class="p">[]</span><span class="kt">string</span><span class="p">{</span>
<span class="w"> </span><span class="s">&quot;http://HOST:9200/&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="nx">es</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">NewClient</span><span class="p">(</span><span class="nx">cfg</span><span class="p">)</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">es</span><span class="p">.</span><span class="nx">Info</span><span class="p">())</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020334_p65215915299">In the information above, <strong id="EN-US_TOPIC_0000001945217690__b179021250122519">HOST</strong> indicates the internal IP address of a cluster node.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_section138140459462"><h4 class="sectiontitle">Connecting to a Security-Mode Cluster</h4><ul id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_ul1568555514618"><li id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_li1685855174619">Connect to a security-mode cluster with HTTPS disabled. The sample code is as follows:<div class="codecoloring" codetype="Go" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_screen182321154121418"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="kn">import</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="s">&quot;github.com/elastic/go-elasticsearch/v7&quot;</span>
<span class="w"> </span><span class="s">&quot;log&quot;</span>
<span class="p">)</span>
<span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">cfg</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">Config</span><span class="p">{</span>
<span class="w"> </span><span class="nx">Addresses</span><span class="p">:</span><span class="w"> </span><span class="p">[]</span><span class="kt">string</span><span class="p">{</span>
<span class="w"> </span><span class="s">&quot;http://HOST:9200/&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nx">Username</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;USERNAME&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nx">Password</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;PASSWORD&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="nx">es</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">NewClient</span><span class="p">(</span><span class="nx">cfg</span><span class="p">)</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">es</span><span class="p">.</span><span class="nx">Info</span><span class="p">())</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
</li></ul>
<ul id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_ul17860315472"><li id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_li378611315477">Connect to a security cluster that has enabled HTTPS and does not use certificates. The sample code is as follows:<div class="codecoloring" codetype="Go" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_screen203571231107"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="kn">import</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="s">&quot;crypto/tls&quot;</span>
<span class="w"> </span><span class="s">&quot;github.com/elastic/go-elasticsearch/v7&quot;</span>
<span class="w"> </span><span class="s">&quot;log&quot;</span>
<span class="w"> </span><span class="s">&quot;net/http&quot;</span>
<span class="p">)</span>
<span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">cfg</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">Config</span><span class="p">{</span>
<span class="w"> </span><span class="nx">Addresses</span><span class="p">:</span><span class="w"> </span><span class="p">[]</span><span class="kt">string</span><span class="p">{</span>
<span class="w"> </span><span class="s">&quot;https://HOST:9200/&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nx">Username</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;USERNAME&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nx">Password</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;PASSWORD&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nx">Transport</span><span class="p">:</span><span class="w"> </span><span class="o">&amp;</span><span class="nx">http</span><span class="p">.</span><span class="nx">Transport</span><span class="p">{</span>
<span class="w"> </span><span class="nx">TLSClientConfig</span><span class="p">:</span><span class="w"> </span><span class="o">&amp;</span><span class="nx">tls</span><span class="p">.</span><span class="nx">Config</span><span class="p">{</span>
<span class="w"> </span><span class="nx">InsecureSkipVerify</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="nx">es</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">NewClient</span><span class="p">(</span><span class="nx">cfg</span><span class="p">)</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">es</span><span class="p">.</span><span class="nx">Info</span><span class="p">())</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
</li></ul>
<ul id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_ul617112328475"><li id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_li141711732104712">Connect to a security cluster that has enabled HTTPS and uses certificates. The sample code is as follows:<div class="codecoloring" codetype="Go" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_screen9415182571117"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="kn">import</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="s">&quot;crypto/tls&quot;</span>
<span class="w"> </span><span class="s">&quot;crypto/x509&quot;</span>
<span class="w"> </span><span class="s">&quot;flag&quot;</span>
<span class="w"> </span><span class="s">&quot;github.com/elastic/go-elasticsearch/v7&quot;</span>
<span class="w"> </span><span class="s">&quot;io/ioutil&quot;</span>
<span class="w"> </span><span class="s">&quot;log&quot;</span>
<span class="w"> </span><span class="s">&quot;net&quot;</span>
<span class="w"> </span><span class="s">&quot;net/http&quot;</span>
<span class="w"> </span><span class="s">&quot;time&quot;</span>
<span class="p">)</span>
<span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">insecure</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">flag</span><span class="p">.</span><span class="nx">Bool</span><span class="p">(</span><span class="s">&quot;insecure-ssl&quot;</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Accept/Ignore all server SSL certificates&quot;</span><span class="p">)</span>
<span class="w"> </span><span class="nx">flag</span><span class="p">.</span><span class="nx">Parse</span><span class="p">()</span>
<span class="w"> </span><span class="c1">// Get the SystemCertPool, continue with an empty pool on error</span>
<span class="w"> </span><span class="nx">rootCAs</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">x509</span><span class="p">.</span><span class="nx">SystemCertPool</span><span class="p">()</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">rootCAs</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="kc">nil</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">rootCAs</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">x509</span><span class="p">.</span><span class="nx">NewCertPool</span><span class="p">()</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// Read in the cert file</span>
<span class="w"> </span><span class="nx">certs</span><span class="p">,</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">ioutil</span><span class="p">.</span><span class="nx">ReadFile</span><span class="p">(</span><span class="s">&quot;/tmp/CloudSearchService.cer&quot;</span><span class="p">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">nil</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Fatalf</span><span class="p">(</span><span class="s">&quot;Failed to append %q to RootCAs: %v&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;xxx&quot;</span><span class="p">,</span><span class="w"> </span><span class="nx">err</span><span class="p">)</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// Append our cert to the system pool</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">ok</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">rootCAs</span><span class="p">.</span><span class="nx">AppendCertsFromPEM</span><span class="p">(</span><span class="nx">certs</span><span class="p">);</span><span class="w"> </span><span class="p">!</span><span class="nx">ok</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="s">&quot;No certs appended, using system certs only&quot;</span><span class="p">)</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="nx">config</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">Config</span><span class="p">{</span>
<span class="w"> </span><span class="nx">Addresses</span><span class="p">:</span><span class="w"> </span><span class="p">[]</span><span class="kt">string</span><span class="p">{</span>
<span class="w"> </span><span class="s">&quot;https://HOST:9200/&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nx">Username</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;USERNAME&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nx">Password</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;PASSWORD&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="nx">Transport</span><span class="p">:</span><span class="w"> </span><span class="o">&amp;</span><span class="nx">http</span><span class="p">.</span><span class="nx">Transport</span><span class="p">{</span>
<span class="w"> </span><span class="nx">MaxIdleConnsPerHost</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span>
<span class="w"> </span><span class="nx">ResponseHeaderTimeout</span><span class="p">:</span><span class="w"> </span><span class="nx">time</span><span class="p">.</span><span class="nx">Second</span><span class="p">,</span>
<span class="w"> </span><span class="nx">DialContext</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="o">&amp;</span><span class="nx">net</span><span class="p">.</span><span class="nx">Dialer</span><span class="p">{</span>
<span class="w"> </span><span class="nx">Timeout</span><span class="p">:</span><span class="w"> </span><span class="mi">30</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="nx">time</span><span class="p">.</span><span class="nx">Second</span><span class="p">,</span>
<span class="w"> </span><span class="nx">KeepAlive</span><span class="p">:</span><span class="w"> </span><span class="mi">30</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="nx">time</span><span class="p">.</span><span class="nx">Second</span><span class="p">,</span>
<span class="w"> </span><span class="p">}).</span><span class="nx">DialContext</span><span class="p">,</span>
<span class="w"> </span><span class="nx">TLSClientConfig</span><span class="p">:</span><span class="w"> </span><span class="o">&amp;</span><span class="nx">tls</span><span class="p">.</span><span class="nx">Config</span><span class="p">{</span>
<span class="w"> </span><span class="nx">InsecureSkipVerify</span><span class="p">:</span><span class="w"> </span><span class="o">*</span><span class="nx">insecure</span><span class="p">,</span>
<span class="w"> </span><span class="nx">RootCAs</span><span class="p">:</span><span class="w"> </span><span class="nx">rootCAs</span><span class="p">,</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="nx">es</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">NewClient</span><span class="p">(</span><span class="nx">config</span><span class="p">)</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">elasticsearch</span><span class="p">.</span><span class="nx">Version</span><span class="p">)</span>
<span class="w"> </span><span class="nx">log</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">es</span><span class="p">.</span><span class="nx">Info</span><span class="p">())</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
</li></ul>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_table118331337182511" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Variables</caption><thead align="left"><tr id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_row15833437142513"><th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.4.5.2.3.1.1"><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p198331837112510">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.4.5.2.3.1.2"><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p1783383762518">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_row383320375257"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.4.5.2.3.1.1 "><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p15833153752514">HOST</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.4.5.2.3.1.2 "><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p18833143722511">IP address for accessing the Elasticsearch cluster. If there are multiple IP addresses, separate them with commas (,).</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_row148340375259"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.4.5.2.3.1.1 "><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p1834153762511">USERNAME</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.4.5.2.3.1.2 "><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p1183412376255">Username for accessing the cluster.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_row208346377257"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.4.5.2.3.1.1 "><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p12834183715254">PASSWORD</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.4.5.2.3.1.2 "><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001961178817_p1083473782518">Password of the user.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_section111224490475"><h4 class="sectiontitle">Running Code</h4><p id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_p8849102991517">Write the code above to the <span class="filepath" id="EN-US_TOPIC_0000001945217690__filepath15826144863811"><b>EsTest.gc</b></span> file based on the cluster type and save the file to an independent directory. Run the following command in that directory to run the code:</p>
<pre class="screen" id="EN-US_TOPIC_0000001945217690__en-us_topic_0000001934020338_screen16569163918188">go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.io,direct
go env -w GONOSUMDB=*
go mod init test
go mod tidy
go run EsTest.go</pre>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="css_01_0210.html">Accessing Elasticsearch Clusters</a></div>
</div>
</div>
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