FSCrawler 2.7 does not support Elasticsearch between 6.0.0 and 6.6.x #720
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Due to a change in 6.7 HLRest Client, FSCrawler ES6X distribution does not support anymore a version before 6.7.
This probably won't be fixed as per discussion in elastic/elasticsearch#41647 so we need to document this breaking change.
Closes #713