JAMES-2080 Allow turning off header indexing in OpenSearch #1516
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Arsnael
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Apr 11, 2023
Indicates if you wish to index headers or not (default: true). Note that specific headers (From, To, Cc, Bcc, Subject, Message-Id, Date, Content-Type) are still indexed in their dedicated type. Header indexing is expensive as each header currently need to be stored as a nested document but turning off headers indexing result in non-strict compliance with the IMAP / JMAP standards.
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Arsnael
approved these changes
Apr 11, 2023
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Indicates if you wish to index headers or not (default: true). Note that specific headers (From, To, Cc, Bcc, Subject, Message-Id, Date, Content-Type) are still indexed in their dedicated type. Header indexing is expensive as each header currently need to be stored as a nested document but turning off headers indexing result in non-strict compliance with the IMAP / JMAP standards.
Before
Indexing 5.000 mails takes ~1 minute and occupies 26MB of index (5KB perf mail) which is consistant with our production mertics. The commit log is more bulky and with index occupies 185 MB.
After
Indexing 10.000 takes ~ 76s and occupies 6.9 MB of index (690 B / mails). The commit log is more bulky and with index occupies 62 MB.
Conclusion
This change allows a dramatic space reduction on OpenSearch (cost saving!) of ~ x8 for the tested workload. We also observed a x2 speedup of the indexation process.