removed elasticsearch dir, wrote a wiki page

elasticsearch/README.md

-# Elasticsearch How To
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-### Initial setup
-From now on I'm assuming that you:
-- indexed some data;
-- created the index.
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-From the terminal open `elasticsearch` and when it's up and running open `kibana`. 
-Go to `http://localhost:5601` (default setting), go to `Discover` tab, choose `tweep` and you should see something like this:
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-![first view](some1.png)
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-(if you are having some troubles with elasticsearch or kibana setup I suggest you to look into the corresponding documentation).
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-### Visualizations setup
-So now we have some data to play with but we need to visualize it as we want some meaning.
-
-Here is a histogram based on daily activity:
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-![daily](daily.png)
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-How to:
-- `Visulize` tab and than the blue `+` symbol;
-- `Vertical bar`;
-- select `tweep`;
-- `X-Axis`, Aggregation: Terms, Field: hour, Order By: Term, Order: Ascending, Size: 24;
-- click on `Add sub-buckets`, Split Series, Sub Aggregation: Terms, Field: username, Order By: Count, Order: Discending (or Ascending, depends on your needs), Size: 5 (for Top 5 or "worsts" 5);
-- click on the blue arrow.
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-You can do the same for a weekly activity, just replace the settings for the X-Axis: `hour` and `Size: 24` with `day` and `Size: 7`.
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-Pie Charts for top users: you can base this on `likes`, `retweets` and `replies`.
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-Following the previous steps:
-- create a Pie chart;
-- Split Slices, Aggregation: Terms, Field: username;
-- etc...
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-**Important**: write `_exists_:likes` or `_exists_:retweets` or `_exists_:replies` to filter out specific rank base.
-You should see something like this:
-![likes](likes.png)
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-### Dashboard setup
-Pretty easy:
-- select `Dashboard` tab;
-- create new one;
-- add previously created visualizations.
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-Now you have a basic setup. More is about to come.
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