AttributeIndex.java: Protect against accidental changes.

Jean-Noel Rouvignac

08.56.2015 4e9638d1d07cda816f5cda6e62168e80ff400f42

 opendj-server-legacy/src/main/java/org/opends/server/backends/pluggable/AttributeIndex.java

@@ -972,7 +972,7 @@

  Map<String, MatchingRuleIndex> getNameToIndexes()
  {
    return nameToIndexes;
    return Collections.unmodifiableMap(nameToIndexes);
  }

  /**