[Bug] MissingMethodException in SchemaManager.removeIndexLabel()

### Bug Type (问题类型)

gremlin (结果不合预期)

### Before submit

- [X] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 [FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)

### Environment (环境信息)

aManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
groovy.lang.MissingMethodException: No signature of method: org.apache.hugegraph.schema.SchemaManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127) ~[groovy-2.5.14-indy.jar:2.5.14]
at Script10311.run(Script10311.groovy:3) ~[?:?]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:676) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:378) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233) ~[?:1.8.0_144]
at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_144]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at org.apache.hugegraph.auth.HugeGraphAuthProxy$ContextTask.run(HugeGraphAuthProxy.java:1860) ~[hugegraph-api-1.0.0.jar:1.0.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_144]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_144]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]

### Expected & Actual behavior (期望与实际表现)

aManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
groovy.lang.MissingMethodException: No signature of method: org.apache.hugegraph.schema.SchemaManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127) ~[groovy-2.5.14-indy.jar:2.5.14]
at Script10311.run(Script10311.groovy:3) ~[?:?]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:676) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:378) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233) ~[?:1.8.0_144]
at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_144]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at org.apache.hugegraph.auth.HugeGraphAuthProxy$ContextTask.run(HugeGraphAuthProxy.java:1860) ~[hugegraph-api-1.0.0.jar:1.0.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_144]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_144]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]

### Vertex/Edge example (问题点 / 边数据举例)

```javascript
aManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
groovy.lang.MissingMethodException: No signature of method: org.apache.hugegraph.schema.SchemaManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127) ~[groovy-2.5.14-indy.jar:2.5.14]
at Script10311.run(Script10311.groovy:3) ~[?:?]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:676) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:378) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233) ~[?:1.8.0_144]
at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_144]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at org.apache.hugegraph.auth.HugeGraphAuthProxy$ContextTask.run(HugeGraphAuthProxy.java:1860) ~[hugegraph-api-1.0.0.jar:1.0.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_144]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_144]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
```

### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

```javascript
aManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
groovy.lang.MissingMethodException: No signature of method: org.apache.hugegraph.schema.SchemaManager.removeIndexLabel() is applicable for argument types: (String) values: [initialDataLabByName]
Possible solutions: getIndexLabel(java.lang.String)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46) ~[groovy-2.5.14-indy.jar:2.5.14]
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127) ~[groovy-2.5.14-indy.jar:2.5.14]
at Script10311.run(Script10311.groovy:3) ~[?:?]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:676) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:378) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233) ~[?:1.8.0_144]
at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:272) ~[gremlin-groovy-3.5.1.jar:3.5.1]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_144]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
at org.apache.hugegraph.auth.HugeGraphAuthProxy$ContextTask.run(HugeGraphAuthProxy.java:1860) ~[hugegraph-api-1.0.0.jar:1.0.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_144]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_144]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
```