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<div class="post-body" itemprop="articleBody"><p>内置脚本语言。</p>
<span id="more"></span>
<h2 id="什么时候可以使用Painless"><a href="#什么时候可以使用Painless" class="headerlink" title="什么时候可以使用Painless"></a>什么时候可以使用Painless</h2><ul>
<li>更新或删除字段；</li>
<li>处理数据聚合；</li>
<li>Script Field：对返回的字段提前进行计算</li>
<li>Function Score：对文档的算分进行处理</li>
<li>Ingest Pipeline中执行脚本</li>
<li>Reindex</li>
<li>Update by Query</li>
</ul>
<h2 id="使用Painless脚本访问字段"><a href="#使用Painless脚本访问字段" class="headerlink" title="使用Painless脚本访问字段"></a>使用Painless脚本访问字段</h2><p>在不同上下文中Painless获取文档字段的语法也有所不同</p>
<ul>
<li>Ingestion中<br><code>ctx.field_name</code></li>
<li>Update<br><code>ctx._source.field_name</code></li>
<li>Search & Aggregation<br><code>doc["field_name"]</code></li>
</ul>
<h2 id="在Ingest-Pipeline中使用Painless"><a href="#在Ingest-Pipeline中使用Painless" class="headerlink" title="在Ingest Pipeline中使用Painless"></a>在Ingest Pipeline中使用Painless</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line">POST _ingest/pipeline/_simulate</span><br><span class="line">{</span><br><span class="line"> "pipeline": {</span><br><span class="line"> "description": "to split blog tags",</span><br><span class="line"> "processors": [</span><br><span class="line"> {</span><br><span class="line"> "split": {</span><br><span class="line"> "field": "tags",</span><br><span class="line"> "separator": ","</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> {</span><br><span class="line"> "script": {</span><br><span class="line"> "source": """</span><br><span class="line"> if(ctx.containsKey("content")){</span><br><span class="line"> ctx.content_length = ctx.content.length();</span><br><span class="line"> }else{</span><br><span class="line"> ctx.content_length=0;</span><br><span class="line"> }</span><br><span class="line">"""</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> {</span><br><span class="line"> "set": {</span><br><span class="line"> "field": "views",</span><br><span class="line"> "value": 0</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> ]</span><br><span class="line"> },</span><br><span class="line"> "docs": [</span><br><span class="line"> {</span><br><span class="line"> "_index": "index",</span><br><span class="line"> "_id": "id",</span><br><span class="line"> "_source": {</span><br><span class="line"> "title": "Introducing big data......",</span><br><span class="line"> "tags": "hadoop,elasticsearch,spark",</span><br><span class="line"> "content": "You konw, for big data"</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> {</span><br><span class="line"> "_index": "index",</span><br><span class="line"> "_id": "idxx",</span><br><span class="line"> "_source": {</span><br><span class="line"> "title": "Introducing cloud computering",</span><br><span class="line"> "tags": "openstack,k8s",</span><br><span class="line"> "content": "You konw, for cloud"</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> ]</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>上面的命令中增加了一个类型为script的processor：</p>
<ul>
<li>如果存在content字段，则计算字段长度，并增加一个长度字段</li>
<li>否则默认取长度为0</li>
</ul>
<h2 id="在更新文档时使用Painless"><a href="#在更新文档时使用Painless" class="headerlink" title="在更新文档时使用Painless"></a>在更新文档时使用Painless</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">PUT tech_blogs/_doc/1</span><br><span class="line">{</span><br><span class="line"> "title":"Introducing big data......",</span><br><span class="line"> "tags":"hadoop,elasticsearch,spark",</span><br><span class="line"> "content":"You konw, for big data",</span><br><span class="line"> "views":0</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">POST tech_blogs/_update/1</span><br><span class="line">{</span><br><span class="line"> "script": {</span><br><span class="line"> "source": "ctx._source.views += params.new_views",</span><br><span class="line"> "params": {</span><br><span class="line"> "new_views":100</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>上面脚本根据参数new_views来更新原文档的views字段。<br>这样做的好处主要是保证文档更新的原子性。</p>
<p>也可以将script保存在Cluster State里，通过id引用：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">POST _scripts/update_views</span><br><span class="line">{</span><br><span class="line"> "script":{</span><br><span class="line"> "lang": "painless",</span><br><span class="line"> "source": "ctx._source.views += params.new_views"</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">POST tech_blogs/_update/1</span><br><span class="line">{</span><br><span class="line"> "script": {</span><br><span class="line"> "id": "update_views",</span><br><span class="line"> "params": {</span><br><span class="line"> "new_views":1000</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="在查询中使用Painless"><a href="#在查询中使用Painless" class="headerlink" title="在查询中使用Painless"></a>在查询中使用Painless</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">GET tech_blogs/_search</span><br><span class="line">{</span><br><span class="line"> "script_fields": {</span><br><span class="line"> "rnd_views": {</span><br><span class="line"> "script": {</span><br><span class="line"> "lang": "painless",</span><br><span class="line"> "source": """</span><br><span class="line"> java.util.Random rnd = new Random();</span><br><span class="line"> doc['views'].value+rnd.nextInt(1000);</span><br><span class="line"> """</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> "query": {</span><br><span class="line"> "match_all": {}</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>修改查询结果，给views字段加上一个随机值。</p>
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