remove elasticsearch_output connector (#620)

* Update changelog
* remove elasticsearch dependency
* remove elasticsearch output
* remove get_conn mock and use responses with ordered registry

CHANGELOG.md

@@ -6,6 +6,8 @@
 * This release limits the maximum python version to `3.12.3` because of the issue
 [#612](https://github.com/fkie-cad/Logprep/issues/612).
 * Remove `normalizer` processor, as it's functionality was replaced by the `grokker`, `timestamper` and `field_manager` processors
+* Remove `elasticsearch_output` connector to reduce maintenance effort
+
 
 ### Features
 

README.md

@@ -15,7 +15,7 @@
 
 Logprep allows to collect, process and forward log messages from various data sources.
 Log messages are being read and written by so-called connectors.
-Currently, connectors for Kafka, Opensearch, ElasticSearch, S3, HTTP and JSON(L) files exist.
+Currently, connectors for Kafka, Opensearch, S3, HTTP and JSON(L) files exist.
 
 The log messages are processed in serial by a pipeline of processors,
 where each processor modifies an event that is being passed through.

doc/source/development/architecture/index.rst

@@ -73,7 +73,7 @@ The Ruletree diagramm shows how the matching rules for a given event are searche
 Output
 ======
 
-In this diagram, the last part about the backlog is specific for the Elasticsearch/ Opensearch Output.
+In this diagram, the last part about the backlog is specific for the Opensearch Output.
 This was deemed to be important enough to be part of the diagram.
 
 .. raw:: html

doc/source/user_manual/configuration/output.rst

@@ -12,7 +12,7 @@ logprep only guaranties that one output has received data by calling the
 .. security-best-practice::
    :title: Output Connectors
    :location: config.output.<Output-Name>.type
-   :suggested-value: <ConfluentKafkaOutput|ElasticsearchOutput|OpensearchOutput|S3Output>
+   :suggested-value: <ConfluentKafkaOutput|OpensearchOutput|S3Output>
 
    Similar to the input connectors there is a list of available output connectors of which some
    are only meant for debugging, namely: :code:`ConsoleOutput` and :code:`JsonlOutput`.
@@ -43,13 +43,6 @@ logprep only guaranties that one output has received data by calling the
    :inherited-members:
    :noindex:
 
-.. automodule:: logprep.connector.elasticsearch.output
-.. autoclass:: logprep.connector.elasticsearch.output.ElasticsearchOutput.Config
-   :members:
-   :undoc-members:
-   :inherited-members:
-   :noindex:
-
 .. automodule:: logprep.connector.opensearch.output
 .. autoclass:: logprep.connector.opensearch.output.OpensearchOutput.Config
    :members: