Merge multiple indexes into one index and visualize it

hello, I created several indexes in kibana and each each index has its own visualizations and dahsboard, the indexes have similar fields (type and meaning, I want to know it's possible to create a merge of these indexes into a single index (by selecting certain fields) to be able to visualize the fields that interest me in this merger
thank you

You could try using an index alias - https://www.elastic.co/guide/en/elasticsearch/reference/7.9/indices-add-alias.html. You just need to be careful of potential field mapping clashes.