Query DSL: flt_field does not allow to set min_similarity and prefix_length, closes elastic#744.

Author: kimchy

modules/elasticsearch/src/main/java/org/elasticsearch/index/query/xcontent/FuzzyLikeThisFieldQueryParser.java

@@ -94,6 +94,10 @@ public class FuzzyLikeThisFieldQueryParser extends AbstractIndexComponent implem
                     boost = parser.floatValue();
                 } else if ("ignore_tf".equals(currentFieldName) || "ignoreTF".equals(currentFieldName)) {
                     ignoreTF = parser.booleanValue();
+                } else if ("min_similarity".equals(currentFieldName) || "minSimilarity".equals(currentFieldName)) {
+                    minSimilarity = parser.floatValue();
+                } else if ("prefix_length".equals(currentFieldName) || "prefixLength".equals(currentFieldName)) {
+                    prefixLength = parser.intValue();
                 }
             }
         }