tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraph.java [407:415]:
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    public <E extends Element> void dropIndex(final String key, final Class<E> elementClass) {
        if (Vertex.class.isAssignableFrom(elementClass)) {
            if (null != this.vertexIndex) this.vertexIndex.dropKeyIndex(key);
        } else if (Edge.class.isAssignableFrom(elementClass)) {
            if (null != this.edgeIndex) this.edgeIndex.dropKeyIndex(key);
        } else {
            throw new IllegalArgumentException("Class is not indexable: " + elementClass);
        }
    }
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tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerTransactionGraph.java [489:497]:
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    public <E extends Element> void dropIndex(final String key, final Class<E> elementClass) {
        if (Vertex.class.isAssignableFrom(elementClass)) {
            if (null != this.vertexIndex) this.vertexIndex.dropKeyIndex(key);
        } else if (Edge.class.isAssignableFrom(elementClass)) {
            if (null != this.edgeIndex) this.edgeIndex.dropKeyIndex(key);
        } else {
            throw new IllegalArgumentException("Class is not indexable: " + elementClass);
        }
    }
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