FIX Use a single space by default for block delimiter in index.

A single space is non-intrusive and will not require any changes within existing projects to avoid changes to the way content is indexed - but providing an option for configuring the delimiter can help avoid false-positive results in phrase queries.

src/Extensions/ElementalPageExtension.php

@@ -25,6 +25,17 @@ class ElementalPageExtension extends ElementalAreasExtension
         'ElementalArea',
     ];
 
+    /**
+     * The delimiter to separate distinct elements in indexed content.
+     *
+     * When using the getElementsForSearch() method to index all elements in a single field,
+     * a custom delimiter can be used help to avoid false positive results for phrase queries.
+     *
+     * @config
+     * @var string
+     */
+    private static $delimiter_for_indexed_elements = ' ';
+
     /**
      * Returns the contents of each ElementalArea has_one's markup for use in Solr or Elastic search indexing
      *
@@ -59,7 +70,7 @@ public function getElementsForSearch()
             // CMS layout can break on the response. (SilverStripe 4.1.1)
             SSViewer::set_themes($oldThemes);
         }
-        return implode(' ... ', $output);
+        return implode($this->config()->get('delimiter_for_indexed_elements'), $output);
     }
 
     public function MetaTags(&$tags)