addding notebook for re-ranking-elasticsearch-hosted blog (#346)

* addding notebook for re-ranking-elasticsearch-hosted blog

* adding cloud trial signup link

* Update supporting-blog-content/re-ranking-elasticsearch-hosted/re-ranking-elasticsearch-hosted.ipynb

fix typo

Co-authored-by: Carly Richmond <[email protected]>

* fixed index name

* typo

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Co-authored-by: Carly Richmond <[email protected]>

Author: jeffvestal