@Test
  public void shouldRemoveDefinedIndexIfRegionAlreadyExists() {
    try {
      createRegion();
      createIndex("field1", "field2", "field3");

    } catch (IllegalStateException e) {
      assertEquals("The lucene index must be created before region", e.getMessage());
      assertEquals(0, ((LuceneServiceImpl) luceneService).getAllDefinedIndexes().size());
    }
  }
Tests of creating lucene indexes on regions. All tests of index creation use cases should be in
classes starting with LuceneIndexCreation*. Most tests belong in this class, except for:
<ul>
<li>Tests that use persistence are in {@link LuceneIndexCreationPersistenceIntegrationTest}</li>
<li>Tests that use offheap are in {@link LuceneIndexCreationOffHeapIntegrationTest}</li>
</ul>
geode-lucene/src/integrationTest/java/org/apache/geode/cache/lucene/LuceneIndexCreationIntegrationTest.java