fix typo and make parseIndexConstraints method static in FieldStatsRequest

Author: javanna

core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsRequest.java

@@ -90,7 +90,7 @@ public void source(BytesReference content) throws IOException {
  break;
  case START_OBJECT:
  if ("index_constraints".equals(fieldName)) {
- parseIndexContraints(indexConstraints, parser);
+ parseIndexConstraints(indexConstraints, parser);
  } else {
  throw new IllegalArgumentException("unknown field [" + fieldName + "]");
  }
@@ -117,8 +117,8 @@ public void source(BytesReference content) throws IOException {
  this.indexConstraints = indexConstraints.toArray(new IndexConstraint[indexConstraints.size()]);
  }
 
- private void parseIndexContraints(List<IndexConstraint> indexConstraints,
- XContentParser parser) throws IOException {
+ private static void parseIndexConstraints(List<IndexConstraint> indexConstraints,
+  XContentParser parser) throws IOException {
  Token token = parser.currentToken();
  assert token == Token.START_OBJECT;
  String field = null;
@@ -213,5 +213,4 @@ public void writeTo(StreamOutput out) throws IOException {
  out.writeString(level);
  out.writeBoolean(useCache);
  }
-
 }