[7.x][DOCS] Adds low-level subsection from ES repo to TOC#28

Merged

swallez merged 1 commit intoelastic:7.xfrom

szabosteve:7.x.add.llrc

Oct 4, 2021

Commits on Oct 1, 2021

[7.x][DOCS] Adds low-level subsection from ES repo to TOC.
szabosteve
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