Query DSL: Allow to control (globally) the max clause count for `bool` query (defaults to 1024), closes #482.

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

@@ -45,6 +45,7 @@ public class BoolQueryParser extends AbstractIndexComponent implements XContentQ
 
     @Inject public BoolQueryParser(Index index, @IndexSettings Settings settings) {
         super(index, settings);
+        BooleanQuery.setMaxClauseCount(settings.getAsInt("index.query.bool.max_clause_count", BooleanQuery.getMaxClauseCount()));
     }
 
     @Override public String[] names() {