Feat: notebook for Elasticsearch integration (#681)

* feat: nb elasticsearch unstructured sentiment

* chore: refactor readme for elasticsearch nb

* fix: update es-credentials.ini

* chore: update es-credentials.ini

* fix: type in nb load-into-es.ipynb

exist --> exists

* fix: typo 2 in nb load-into-es.ipynb

obtaing --> obtain

Author: LaverdeS

examples/elastic-search/README.md

@@ -0,0 +1,13 @@
+# Loading `Unstructured` elements into `Elasticsearch`
+
+The following example shows how to load `Unstructured` output `Element` objects into an `Elasticsearch`
+index with sentiment analyis scores provided by the `TextBlob` library. 
+
+Elasticsearch stores data as JSON documents in an index, which is a collection of documents that are related to each other. 
+
+
+## Running the example
+
+1. Run `pip install -r requirements.txt` to install the Python dependencies.
+1. Modify `es-credentials.ini` with your information: `cloud_id`, `user` and `password`.
+1. Run the `load-into-es.ipynb` notebook.

examples/elastic-search/es-credentials.ini

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+[ELASTIC]
+cloud_id = Search_project:CLOUD_ID==
+user = USER
+password = PASSWORD