索引文件未被清理，重启卡顿

如题，运行之后发现大量索引文件不回被自动merge和删除清理，
而是在每次重启的时候执行文件删除操作。表现为系统启动过程非常耗时，看启动过程大量时间消耗在索引文件删除过程

```
"main" #1 prio=5 os_prio=0 tid=0x00007fe04404e800 nid=0x38217a runnable [0x00007fe049519000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.fs.UnixNativeDispatcher.unlink0(Native Method)
	at sun.nio.fs.UnixNativeDispatcher.unlink(UnixNativeDispatcher.java:146)
	at sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:231)
	at sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103)
	at java.nio.file.Files.delete(Files.java:1126)
	at org.apache.lucene.store.FSDirectory.privateDeleteFile(FSDirectory.java:370)
	at org.apache.lucene.store.FSDirectory.deleteFile(FSDirectory.java:339)
	at org.apache.lucene.store.LockValidatingDirectoryWrapper.deleteFile(LockValidatingDirectoryWrapper.java:38)
	at org.apache.lucene.index.IndexFileDeleter.deleteFile(IndexFileDeleter.java:696)
	at org.apache.lucene.index.IndexFileDeleter.deleteFiles(IndexFileDeleter.java:690)
	at org.apache.lucene.index.IndexFileDeleter.<init>(IndexFileDeleter.java:238)
	at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:898)
	- locked <0x00000006d2b96048> (a org.apache.lucene.index.IndexWriter)
	at com.alone.embedded.lucene.core.SourceFactory.createWriter(SourceFactory.java:90)
	at com.alone.embedded.lucene.core.Source.<init>(Source.java:64)
	at com.alone.embedded.lucene.core.SourceFactory.createSource(SourceFactory.java:60)
	at com.alone.embedded.lucene.core.EmbeddedLucene.lambda$buildSource$0(EmbeddedLucene.java:95)
	at com.alone.embedded.lucene.core.EmbeddedLucene$$Lambda$371/1480805145.apply(Unknown Source)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1580)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
	at com.alone.embedded.lucene.core.EmbeddedLucene.buildSource(EmbeddedLucene.java:104)
	at com.alone.embedded.lucene.core.EmbeddedLucene.start(EmbeddedLucene.java:61)
	- locked <0x00000006d2b961a0> (a com.alone.embedded.lucene.spring.SpringEmbeddedLucene)
	at com.alone.embedded.lucene.spring.SpringEmbeddedLucene.<init>(SpringEmbeddedLucene.java:25)
	at com.alone.embedded.lucene.spring.EmbeddedLuceneAutoConfiguration.springEmbeddedLucene(EmbeddedLuceneAutoConfiguration.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:651)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:636)
```

Alone/embedded-lucene

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Alone/embedded-lucene .gitee-modal { width: 500px !important; }

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