code: @SuppressFBWarnings("RV_RETURN_VALUE_IGNORED_NO_SIDE_EFFECT")
      public static void dropIndex(final ODatabaseObject db, final String indexName) {
          // Separated to overcome findbugs false positive "RV_RETURN_VALUE_IGNORED_NO_SIDE_EFFECT" for dropIndex method.
          db.getMetadata().getIndexManager().dropIndex(indexName);
      }
docs: Drops named index. Safe to call even if index not exist.
  
  @param db        database object
  @param indexName index name
  @see com.orientechnologies.orient.core.index.OIndexManagerProxy#dropIndex(java.lang.String)