Creating Image Mosaic store with two dimensions, PostGIS indexing fails - geoserver

Question

I have a collection of GeoTIFFs that I would like to publish as a GeoServer image mosaic.
The image mosaics have denominated the following dimensions in their file name:
sc[000] as the scenario, and
ar[0000] as the relevant area of interest
My folder thus looks like this:
datastore.properties
indexer.properties
arearegex.properties
scenarioregex.properties
ut_sc090_ar0050.tif
ut_sc090_ar0051.tif
ut_sc090_ar0052.tif
ut_sc090_ar0053.tif
ut_sc110_ar0050.tif
ut_sc110_ar0051.tif
ut_sc110_ar0052.tif
ut_sc110_ar0053.tif
The file contents are
datastore.properties
SPI=org.geotools.data.postgis.PostgisNGDataStoreFactory
host=db
port=5432
database=gis
schema=image_mosaics
user=postgres
passwd=postgres
Loose\ bbox=true
Estimated\ extends=false
validate\ connections=true
Connection\ timeout=10
preparedStatements=true
I can verify the connection by copying this datastore.properties file to another "simpler" Image Mosaic configuration. Also, I had empty index tables being created in my PostGIS instance, even when the indexer was still misconfigured. No index table is created in this case.
Edit: Both GeoServer and PostGIS live in a Docker stack, thus the host=db is correct.
indexer.properties
Schema=*the_geom:Polygon,location:String,scenario:Integer,ezg:Integer
PropertyCollectors=IntegerFileNameExtractorSPI[scenarioregex](scenario),IntegerFileNameExtractorSPI[arearegex](area)
ElevationAttribute=scenario
AdditionalDomainAttributes=area(area)
Caching=false
Recursive=false
Using the built-in ElevationAttribute key for scenarios as it follows the same logic.
scenarioregex.properties
regex=(?<=_sz)([0-9]{3})(?=_)
Supposed to capture any 3-digit number between _sz and _
arearegex.properties
regex=(?<=_ar)([0-9]{4})
Supposed to capture any 4-digit number after _ar
After numerous different combinations of regex, indexing, etc. As GeoServer does not throw specific error messages, I am in need of a second set of eyes. I am wondering if it is possible to create an Image Mosaic store without time dimension.
Thank you!
Edit2: GeoServer Error message on trying to create the Image Mosaic below:
2022-03-21 08:51:17,764 ERROR [org.geotools.gce.imagemosaic] -
java.lang.NullPointerException
at org.geotools.gce.imagemosaic.ImageMosaicFileFeatureConsumer$ImageMosaicFileConsumer.handleElement(ImageMosaicFileFeatureConsumer.java:244)
at org.geotools.gce.imagemosaic.ImageMosaicFileFeatureConsumer$ImageMosaicFileConsumer.handleElement(ImageMosaicFileFeatureConsumer.java:136)
at org.geotools.gce.imagemosaic.ImageMosaicDirectoryWalker$MosaicDirectoryWalker.handleElement(ImageMosaicDirectoryWalker.java:169)
at org.geotools.gce.imagemosaic.ImageMosaicDirectoryWalker$MosaicDirectoryWalker.handleFile(ImageMosaicDirectoryWalker.java:99)
at org.apache.commons.io.DirectoryWalker.walk(DirectoryWalker.java:387)
at org.apache.commons.io.DirectoryWalker.walk(DirectoryWalker.java:355)
at org.geotools.gce.imagemosaic.ImageMosaicDirectoryWalker$MosaicDirectoryWalker.<init>(ImageMosaicDirectoryWalker.java:121)
at org.geotools.gce.imagemosaic.ImageMosaicDirectoryWalker.run(ImageMosaicDirectoryWalker.java:218)
at org.geotools.gce.imagemosaic.Utils.createMosaic(Utils.java:531)
at org.geotools.gce.imagemosaic.Utils.checkSource(Utils.java:1563)
at org.geotools.gce.imagemosaic.ImageMosaicReader.initReaderFromURL(ImageMosaicReader.java:263)
at org.geotools.gce.imagemosaic.ImageMosaicReader.<init>(ImageMosaicReader.java:216)
at org.geotools.gce.imagemosaic.ImageMosaicFormat.getReader(ImageMosaicFormat.java:584)
at org.geotools.gce.imagemosaic.ImageMosaicFormat.getReader(ImageMosaicFormat.java:111)
at org.geoserver.catalog.ResourcePool.getGridCoverageReader(ResourcePool.java:1573)
at org.geoserver.catalog.ResourcePool.getGridCoverageReader(ResourcePool.java:1518)
at org.geoserver.catalog.ResourcePool.getGridCoverageReader(ResourcePool.java:1505)
at org.geoserver.web.data.store.CoverageStoreEditPage.onSave(CoverageStoreEditPage.java:126)
at org.geoserver.web.data.store.AbstractCoverageStorePage$2.onSubmitInternal(AbstractCoverageStorePage.java:160)
at org.geoserver.web.GeoserverAjaxSubmitLink.onSubmit(GeoserverAjaxSubmitLink.java:38)
at org.apache.wicket.ajax.markup.html.form.AjaxSubmitLink$1.onSubmit(AjaxSubmitLink.java:111)
at org.apache.wicket.ajax.form.AjaxFormSubmitBehavior$AjaxFormSubmitter.onSubmit(AjaxFormSubmitBehavior.java:218)
at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1312)
at org.apache.wicket.markup.html.form.Form.process(Form.java:976)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:797)
at org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:174)
at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:155)
at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:601)
at sun.reflect.GeneratedMethodAccessor222.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:241)
at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:248)
at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:234)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:895)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
at org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:159)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:166)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:28)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:73)
at org.geoserver.ows.HTTPHeadersCollector.doFilter(HTTPHeadersCollector.java:48)
at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:70)
at org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:43)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:71)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:75)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:71)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:75)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:53)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:71)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:75)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
at org.geoserver.security.filter.GeoServerUserNamePasswordAuthenticationFilter.doFilter(GeoServerUserNamePasswordAuthenticationFilter.java:122)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:71)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:158)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:75)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:71)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:52)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:75)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:142)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:102)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.XFrameOptionsFilter.doFilter(XFrameOptionsFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:48)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)