Replace Python module elasticsearch by opensearch-py

Stefan Weilrequested to merge
stweil/escriptorium:opensearch into develop

The Python module opensearch-py is newer and well maintained. It supports Elasticsearch and OpenSearch databases.

The new code uses "Elasticsearch/OpenSearch" in messages and replaces "ESCRIPTORIUM" in several settings by "ES" which now means eScriptorium:

DISABLE_ELASTICSEARCH -> DISABLE_ES_SEARCH
ELASTICSEARCH_COMMON_INDEX -> ES_SEARCH_COMMON_INDEX
ELASTICSEARCH_URL -> ES_SEARCH_URL

Signed-off-by: Stefan Weil sw@weilnetz.de

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