[Search] Related to Elastic search upgrade need to document change impact to apps moving from R2 to R3
When upgrading Elastic to the new version (expected 7.8) it is likely that the search syntax may change to accommodate new types (flattened). We need to document and create a prescription of how apps can migrate from R2 (6.x) to R3 (elastic 7.8) search syntax.
Should also note that the data migration is not part of this deliverable. Providers may need to reindex data or perhaps reload based on updated data models for R3.
@Dmitriy_Rudko @ethiraj @Nieten @dkodeih to please review this description and refine. Thanks.