Not able to understand the logs of shrink index API?

Hi Everyone,

Elasticsearch version - 6.4.1

Can anyone explain me the given below debug logs in detail:

  1. [node1] [index2][0] bootstrap a new history_uuid [{local_checkpoint=-1, history_uuid=Dz_7d05nTE2SlToGdT7 5Eg, max_seq_no=-1}], user_data [{local_checkpoint=-1, max_unsafe_auto_id_timestamp=-1, max_seq_no=-1}]

  2. [node1] [index2][0] starting index commit [{history_uuid=Dz_7d05nTE2SlToGdT75Eg, local_checkpoint=-1, ma x_seq_no=-1, max_unsafe_auto_id_timestamp=-1, translog_generation=1, translog_uuid=lEC7YUq-Sy2cdYfHrISGrQ}]

  3. [node1] [index2][0] open uncommitted translog checkpoint Checkpoint{offset=55, numOps=0, generation=1, m inSeqNo=-1, maxSeqNo=-1, globalCheckpoint=-1, minTranslogGeneration=1, trimmedAboveSeqNo=-2}

  4. [node1] [index2][0] Safe commit [CommitPoint{segment[segments_4], userData[{history_uuid=Dz_7d05nTE2SlTo GdT75Eg, local_checkpoint=-1, max_seq_no=-1, max_unsafe_auto_id_timestamp=-1, translog_generation=1, translog_uuid=lEC7YUq-Sy2cdYfHrISGrQ}]}], last commit [CommitPo int{segment[segments_4], userData[{history_uuid=Dz_7d05nTE2SlToGdT75Eg, local_checkpoint=-1, max_seq_no=-1, max_unsafe_auto_id_timestamp=-1, translog_generation=1, translog_uuid=lEC7YUq-Sy2cdYfHrISGrQ}]}]

Regards
Nikhil Kapoor

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