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Relevant Search: With Applications for Solr and Elasticsearch

For more in depth reading about search, ranking and generally everything you could ever want to know about how lucene, elasticsearch or solr work under the hood I highly suggest this book. Easily one of the most interesting technical books I have read in a long time. If you are tasked with solving search relevance problems even if not in Solr or Elasticsearch it should be your first reference. Amazon Affiliate Link
https://bitbucket.org/Naked_Yoshi/sq_kanban
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376<li class="toctree-l2"><a class="reference internal" href="helpers/path_helper.html">Path Helper</a></li>
377<li class="toctree-l2"><a class="reference internal" href="helpers/security_helper.html">Security Helper</a></li>
378<li class="toctree-l2"><a class="reference internal" href="helpers/smiley_helper.html">Smiley Helper</a></li>
379<li class="toctree-l2"><a class="reference internal" href="helpers/string_helper.html">String Helper</a></li>
380<li class="toctree-l2"><a class="reference internal" href="helpers/text_helper.html">Text Helper</a></li>
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382<li class="toctree-l2"><a class="reference internal" href="helpers/url_helper.html">URL Helper</a></li>
383<li class="toctree-l2"><a class="reference internal" href="helpers/xml_helper.html">XML Helper</a></li>
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