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POSymbols in query-string for elasticsearch
 

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    <p>I have "documents" (activerecords) with an attribute called deviations. The attribute has values like "Bin X" "Bin $" "Bin q" "Bin %" etc.</p> <p>I am trying to use tire/elasticsearch to search the attribute. I am using the whitespace analyzer to index the deviation attribute. Here is my code for creating the indexes:</p> <pre><code>settings :analysis =&gt; { :filter =&gt; { :ngram_filter =&gt; { :type =&gt; "nGram", :min_gram =&gt; 2, :max_gram =&gt; 255 }, :deviation_filter =&gt; { :type =&gt; "word_delimiter", :type_table =&gt; ['$ =&gt; ALPHA'] } }, :analyzer =&gt; { :ngram_analyzer =&gt; { :type =&gt; "custom", :tokenizer =&gt; "standard", :filter =&gt; ["lowercase", "ngram_filter"] }, :deviation_analyzer =&gt; { :type =&gt; "custom", :tokenizer =&gt; "whitespace", :filter =&gt; ["lowercase"] } } } do mapping do indexes :id, :type =&gt; 'integer' [:equipment, :step, :recipe, :details, :description].each do |attribute| indexes attribute, :type =&gt; 'string', :analyzer =&gt; 'ngram_analyzer' end indexes :deviation, :analyzer =&gt; 'whitespace' end end </code></pre> <p>The search seems to work fine when the query string contains no special characters. For example <code>Bin X</code> will return only those records that have the words <code>Bin</code> AND <code>X</code> in them. However, searching for something like <code>Bin $</code> or <code>Bin %</code> shows all results that have the word <code>Bin</code> almost ignoring the symbol (results with the symbol do show up higher in the search that results without).</p> <p>Here is the search method I have created</p> <pre><code>def self.search(params) tire.search(load: true) do query { string "#{params[:term].downcase}:#{params[:query]}", default_operator: "AND" } size 1000 end end </code></pre> <p>and here is how I am building the search form:</p> <pre><code>&lt;div&gt; &lt;%= form_tag issues_path, :class=&gt; "formtastic issue", method: :get do %&gt; &lt;fieldset class="inputs"&gt; &lt;ol&gt; &lt;li class="string input medium search query optional stringish inline"&gt; &lt;% opts = ["Description", "Detail","Deviation","Equipment","Recipe", "Step"] %&gt; &lt;%= select_tag :term, options_for_select(opts, params[:term]) %&gt; &lt;%= text_field_tag :query, params[:query] %&gt; &lt;%= submit_tag "Search", name: nil, class: "btn" %&gt; &lt;/li&gt; &lt;/ol&gt; &lt;/fieldset&gt; &lt;% end %&gt; &lt;/div&gt; </code></pre>
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    1. COYou don't just escape the characters have a meaning to Lucene with a backslash? Of course, in a Ruby string you'd need a double backslash \\ to escape the ruby character before it hits the Elastic Search api. I've not tried Tire, so I don't know if it works in your world. FYI, here is a quick reference to the characters affected: http://docs.lucidworks.com/display/lweug/Escaping+Special+Syntax+Characters
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    2. COI don't think this is the issue because queries Bin $ or Bin % are affected, but they are not listed in the link above as a special character.
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    3. COI know from my own experience of full text search in databases (Oracle I think it was, and MySQL for LIKE tests in varchar or text fields) that % is a 'match everything' character. Maybe that link above is incomplete, or maybe its not relevant to your issue. Have you tried escaping to see if that solves the problem?
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