Can logstash output be written to a specific database and then read by elastic search from that same database?

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Yes, Logstash can be configured to output data to a specific database and ElasticSearch can be configured to read data from that same database. However, it is important to ensure that the data is in a format that ElasticSearch can index and search efficiently. This can be achieved by defining Logstash output to produce data in a suitable format and mapping the fields to match the schema expected by ElasticSearch.