Upgrade to Hibernate Search 6.0.0.Beta5

[yrodiere]

@gsmet We also need to add this to the migration guide (I can't edit the wiki):

## Hibernate Search + Elasticsearch (Preview)

### Search DSL

A few methods in the Search DSL have been renamed:

* `searchSession.search(...).predicate(...)` becomes `searchSession.search(...).where(...)`.
* `searchSession.search(...).asProjection(...)` becomes `searchSession.search(...).select(...)`.
* `searchSession.search(...).asProjections(...)` becomes `searchSession.search(...).select(...)`.
* `searchSession.search(...).asEntity(...)` becomes `searchSession.search(...).selectEntity()`.
* `searchSession.search(...).asEntityReference(...)` becomes `searchSession.search(...).selectEntityReference()`.

The methods with the old name are still present, though deprecated.
They will be removed before Hibernate Search 6.0.0.Final is released.

### Index layout

Elasticsearch indexes are now accessed through aliases only.
Hibernate Search relies on two aliases for each index: one for writes (`<myindex>-write`) and one for reads (`<myindex>-read`).

As a result, you will need to either create the two aliases,
or drop your indexes and have Hibernate Search re-create empty indexes on startup: it will create the aliases.

See [this section of the reference documentation](https://docs.jboss.org/hibernate/search/6.0/reference/en-US/html_single/#backend-elasticsearch-indexlayout)
for more information about index layout.

### Configuration

The names of synchronization strategies for automatic indexing have changed:

* `queued` => `async`.
* `committed` (the default) => `write-sync` (still the default).
* `searchable` (commonly used for tests) => `sync` (still recommended for tests only).

So if your configuration looked like this:

```
quarkus.hibernate-search.automatic_indexing.synchronization.strategy = queued
```

You should now have this:

```
quarkus.hibernate-search.automatic_indexing.synchronization.strategy = async
```

And if it looked like this:

```
quarkus.hibernate-search.automatic_indexing.synchronization.strategy = searchable
```

You should now have this:

```
quarkus.hibernate-search.automatic_indexing.synchronization.strategy = sync
```

See [this section of the reference documentation](https://docs.jboss.org/hibernate/search/6.0/reference/en-US/html_single/#mapper-orm-indexing-automatic-synchronization) for more information about synchronization strategies.

[yrodiere]

I force-pushed an update restoring reflection on some GSON type adapters. I do not know why the native test for Data5 failed, it looks related to git. Can someone restart it? I don't think I can.

[yrodiere]

@gsmet Fixed the remaining problems. The windows build is failing because of RestEasy?

[ERROR] Tests run: 5, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 12.916 s <<< FAILURE! - in io.quarkus.resteasy.test.NotFoundExceptionMapperTestCase
[ERROR] shouldNotDisplayDeletedFileIn404ErrorPage  Time elapsed: 3.68 s  <<< ERROR!
java.io.UncheckedIOException: 
java.nio.file.FileSystemException: D:\a\quarkus\quarkus\extensions\resteasy\deployment\target\quarkus-dev-mode-test6166822625422934302\src\main\resources\META-INF\resources\test.html: The process cannot access the file because it is being used by another process.

	at io.quarkus.test.QuarkusDevModeTest.deleteResourceFile(QuarkusDevModeTest.java:443)
	at io.quarkus.resteasy.test.NotFoundExceptionMapperTestCase.shouldNotDisplayDeletedFileIn404ErrorPage(NotFoundExceptionMapperTestCase.java:86)
	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.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686)
	at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
	at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
	at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)

[gsmet]

Merged, thanks!