Issue with stats indices

[ntarocco]

Even if we set to have an index per year in the config, it looks like that monthly indices are still created:

GET /_cat/indices/cds-rdm-prod-stats-record-view-*?s=index&h=index

cds-rdm-prod-stats-record-view-2025
cds-rdm-prod-stats-record-view-2025-01
cds-rdm-prod-stats-record-view-2025-02
cds-rdm-prod-stats-record-view-2025-03
cds-rdm-prod-stats-record-view-2025-04
cds-rdm-prod-stats-record-view-2025-05
cds-rdm-prod-stats-record-view-2025-06
cds-rdm-prod-stats-record-view-2025-07
cds-rdm-prod-stats-record-view-2025-08
cds-rdm-prod-stats-record-view-2025-09
cds-rdm-prod-stats-record-view-2025-10
cds-rdm-prod-stats-record-view-2025-11

This should not happen.

1. understand why and fix it
2. merge monthly indices into the yearly one, making sure that there is no duplication or loss of data
3. delete the monthly indices