Suppose I have elasticsearch index_1 with some data. I've created a new index index_2 and created a logstash pipeline to replicate data from index_1 to index_2. After having all data in index_2, pipeline is closed.
Now I've inserted new documents in index_1, and run logstash pipeline again. What will happen now,
will it replicate all the data from index_1?
or only newly created documents will be considered? if yes, how logstash keep tracking of documents. I can see 'timestamp' added in logs, but not able to understand the behaviour.