How to read ealsticsearch as input in logstash only once

Need to take the values from an elastic index_1 through logstash then process it and insert it to another elastic index_2. This is the process i am doing.
But once the input read index_1 and inserted to index_2, the logstash repeats the process.
So i do not want to repeat the process and want to only read the index_1 once and insert to index_2.
Is there any way to do that ?
Thanks in advance.

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