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Hi, awesome community!
In this article, you can read info about the tool which helps me with search index investigation.
At the moment, I do an investigation with the Russian language stemming and reuse the morphology analysis by reusing existing libraries.
So, as I understand, today we will speak about Apache Lucene index and small awesome utility Apache Luke.
Because this search engine library is used for full-text search in the Apache Lucene, Solr, Elasticsearch as well.
It means Jira, Confluence, Bamboo on-premises solution used Lucene, Bitbucket used the Elasticsearch. About Cloud, I imagine the Atlassian team used Elasticsearch as it scales easier even Apache Lucene local index. e.g. for Lucene, you need to use for the replication (lucene-replicator - https://lucene.apache.org/core/7_4_0/replicator/org/apache/lucene/replicator/Replicator.html)
or just use Elasticsearch.
Let’s use Apache Luke for the Confluence search indexes:
As example you will see like this logs:
[2020-03-08T18:04:08,397] WARN (IndexUtils.java:86) - Format version is not supported (resource BufferedChecksumIndexInput(SimpleFSIndexInput(path="/Users/gonchik.tsymzhitov/temp/lucene/META-INF/112/edge/segments_1"))): 0 (needs to be between 7 and 9). This version of Lucene only supports indexes created with release 6.0 and later.
org.apache.lucene.index.IndexFormatTooOldException: Format version is not supported (resource BufferedChecksumIndexInput(SimpleFSIndexInput(path="/Users/gonchik.tsymzhitov/temp/lucene/META-INF/112/edge/segments_1"))): 0 (needs to be between 7 and 9). This version of Lucene only supports indexes created with release 6.0 and later.
If you click explain structure, you can find the cause of that rules https://confluence.atlassian.com/doc/confluence-search-syntax-158720.html
That’s all for today.
Solution architect | DevOps
170 accepted answers