VRTS reports in it's system log as quoted below. Please check.
Sun Dec 31 09:08:12 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...
Sun Dec 31 09:07:12 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...
Sun Dec 31 09:06:12 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...
Sun Dec 31 09:05:12 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...
Sun Dec 31 09:04:11 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...
Sun Dec 31 09:03:11 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...
Sun Dec 31 09:02:11 2023 (UTC) error OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-10 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker: Error: Active indexing process already running! Skipping...