I have data in indice parsed with custom pipeline. After reindex that indice i can’t make aggregations (in discover module i see only empty fields) and visualizations from that data however data are still searchable.
Also i found that for some reason i have new fields that ends for .keyword. Like in screen below
You must apply the mapping before starting the reindex operation. Otherwise Elasticsearch is using the default mapping which is probably not what you had in the old index.
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