Read data from ES, and count number of occurrences of keywords or keysentences (by page) and group by year

Read data previously stored in HDFS
Query module: defoe.es.queries.keysearch_by_year
Configuration file:
- preprocessing treatment to select (preprocess)
- File with keywords or keysentece (data)
- Examples:
  - preprocess: normalize
  - data: sc_cities.txt
Result format:

<YEAR>:
- [<WORD|SENTENCE>, <NUM_WORDS|NUM_SENTENCES>]
- ...
<YEAR>:
...

Note-1: You will need to have the data previously stored in ES using defoe.nls.queries.write_pages_df_es.

Important: We recommend to read also the documentation for writing and reading data from/to PSQL.