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To collect data from particular indices, configure the
xpack.monitoring.collection.indices setting in elasticsearch.yml.
You can specify multiple indices as a comma-separated list or
use an index pattern to match multiple indices:
xpack.monitoring.collection.indices: logstash-*, index1, test2
You can prepend + or - to explicitly include or exclude index
names or patterns. For example, to include all indices that
start with test except test3, you could specify +test*,-test3.