I don't know whether when we update data in SqlServer to ES by Logstash, ES will reindex all or not ?
Welcome!
I moved your question to #logstash.
The jdbc input plugin runs the query you defined. If the query does not include any timestamp like SELECT * FROM TABLE, then everything gets read again and reindexed.
Have a look at https://www.elastic.co/guide/en/logstash/current/plugins-inputs-jdbc.html#_state to see how you can use a column to read only the last changes, supposing that you have this information in your tables.
Okay I got it. Thank you very much. It's useful for me
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