For the specific client the Solr 8.1 is not usable with this bug.

Collection aliases are also a crucial feature for doing “zero-downtime” 
reindexing or changing the Schema of a collection or for switching back to an 
old Index if the new Index structure has bugs etc.

However  I also understand that there are other considerations by other people.

> Am 16.05.2019 um 11:55 schrieb Ishan Chattopadhyaya 
> <ichattopadhy...@gmail.com>:
> 
> Does this warrant a 8.1.1 release? I think this is serious enough.
> 
>> On Thu, May 16, 2019 at 12:03 PM Jörn Franke <jornfra...@gmail.com> wrote:
>> 
>> SOLR-13475
>> 
>>> Am 16.05.2019 um 05:24 schrieb Ishan Chattopadhyaya 
>>> <ichattopadhy...@gmail.com>:
>>> 
>>> Please open a JIRA.
>>> 
>>>> On Thu, 16 May, 2019, 8:09 AM Jörn Franke, <jornfra...@gmail.com> wrote:
>>>> Sorry autocorrection. It is not only a admin UI issue. I described in my 
>>>> previous email that access through the collection alias does not work. I 
>>>> cannot even do execute the select query handler if I use the collection 
>>>> alias instead of the collection name.
>>>> So it is maybe more problematic.
>>>> 
>>>>> Am 16.05.2019 um 04:36 schrieb Jörn Franke <jornfra...@gmail.com>:
>>>>> 
>>>>> Note only an admin UI issue. Access collections via their alias does not 
>>>>> work.
>>>>> 
>>>>>> Am 15.05.2019 um 15:47 schrieb Mikhail Khludnev <m...@apache.org>:
>>>>>> 
>>>>>> It seems creating alias in Solr Admin UI is broken. It's a minor issue 
>>>>>> for 8.1.0
>>>>>> I've alias via REST call 
>>>>>> http://localhost:8983/solr/admin/collections?action=CREATEALIAS&name=testalias&collections=gettingstarted
>>>>>>   successfully.
>>>>>> Jörn, thanks for reporting.
>>>>>> 
>>>>>>> On Tue, May 14, 2019 at 11:03 PM Jörn Franke <jornfra...@gmail.com> 
>>>>>>> wrote:
>>>>>>> Hi,
>>>>>>> 
>>>>>>> I tried to upgrade from 8.0 to 8.1. I noticed that there is an issue 
>>>>>>> with
>>>>>>> collection aliases, but I am not 100% sure it is due to the upgrade.
>>>>>>> 
>>>>>>> Situation:
>>>>>>> I have a collection called c_testcollection.
>>>>>>> I have an alias called testcollection.
>>>>>>> Alias "testcollection" points to "c_testcollection".
>>>>>>> On Solr 8.0 no issue
>>>>>>> 
>>>>>>> After upgrade to Solr 8.1:
>>>>>>> When I do a query on c_testcollection then there is no issue:
>>>>>>> http://localhost:8983/solr/c_testcollection/select?q=test
>>>>>>> When I do a query on testcollection then I receive the stacktrace below
>>>>>>> http://localhost:8983/solr/testcollection/select?q=test
>>>>>>> 
>>>>>>> Additionally I observe a strange behavior in the admin ui. When I try to
>>>>>>> create an alias (e.g. new) for a new collection (e.g. c_new) then it
>>>>>>> creates two aliases:
>>>>>>> new => c_new
>>>>>>> c_new => c_new
>>>>>>> if i then do a query on the alias new it works without issues. If I 
>>>>>>> remove
>>>>>>> the alias from c_new to c_new then I get the same error. Is this desired
>>>>>>> behaviour?
>>>>>>> It is rather annoying to have unnecessary aliases, because I need to 
>>>>>>> filter
>>>>>>> them out in my application when retrieving all aliases.
>>>>>>> Is there a related issue.
>>>>>>> 
>>>>>>> Here the stacktrace:
>>>>>>> {
>>>>>>>  "error":{
>>>>>>>    "trace":"java.lang.NullPointerException\n\tat
>>>>>>> java.base/java.util.AbstractCollection.addAll(AbstractCollection.java:351)\n\tat
>>>>>>> org.apache.solr.common.cloud.Aliases.resolveAliasesGivenAliasMap(Aliases.java:258)\n\tat
>>>>>>> org.apache.solr.common.cloud.Aliases.resolveAliases(Aliases.java:181)\n\tat
>>>>>>> org.apache.solr.servlet.HttpSolrCall.resolveCollectionListOrAlias(HttpSolrCall.java:385)\n\tat
>>>>>>> org.apache.solr.servlet.HttpSolrCall.init(HttpSolrCall.java:273)\n\tat
>>>>>>> org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:486)\n\tat
>>>>>>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:397)\n\tat
>>>>>>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:343)\n\tat
>>>>>>> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)\n\tat
>>>>>>> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)\n\tat
>>>>>>> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)\n\tat
>>>>>>> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)\n\tat
>>>>>>> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)\n\tat
>>>>>>> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat
>>>>>>> org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)\n\tat
>>>>>>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat
>>>>>>> org.eclipse.jetty.server.Server.handle(Server.java:502)\n\tat
>>>>>>> org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)\n\tat
>>>>>>> org.eclipse.jetty.server.HttpChannel.run(HttpChannel.java:305)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)\n\tat
>>>>>>> org.eclipse.jetty.http2.HTTP2Connection.produce(HTTP2Connection.java:171)\n\tat
>>>>>>> org.eclipse.jetty.http2.HTTP2Connection.onFillable(HTTP2Connection.java:126)\n\tat
>>>>>>> org.eclipse.jetty.http2.HTTP2Connection$FillableCallback.succeeded(HTTP2Connection.java:338)\n\tat
>>>>>>> org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)\n\tat
>>>>>>> org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:411)\n\tat
>>>>>>> org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:305)\n\tat
>>>>>>> org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:159)\n\tat
>>>>>>> org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)\n\tat
>>>>>>> org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)\n\tat
>>>>>>> org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)\n\tat
>>>>>>> java.base/java.lang.Thread.run(Thread.java:834)\n",
>>>>>>>    "code":500}}
>>>>>>> 
>>>>>>> 
>>>>>>> Thank you.
>>>>>>> 
>>>>>>> Best regards
>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Sincerely yours
>>>>>> Mikhail Khludnev
> 
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