Remove deprecated java-modules kafka, http and elasticsearch (#197)

Author: kovgeri01

_data/navigation.yml

@@ -379,11 +379,6 @@ admin-guide-nav:
         url: /admin-guide/070_Destinations/081_http/002_Python_http_header_plugin
       - title: "The Azure auth header plugin"
         url: /admin-guide/070_Destinations/081_http/003_Azure_auth_header_plugin
-    - title: "http-java"
-      url: /admin-guide/070_Destinations/085_http-java/README
-      subnav:
-      - title: "HTTP Java destination options"
-        url: /admin-guide/070_Destinations/085_http-java/000_http_java_options
     - title: "kafka"
       url: /admin-guide/070_Destinations/100_Kafka-c/README
       subnav:

doc/_admin-guide/030_Installing_syslog-ng/000_Compiling_syslog-ng_from_source.md

@@ -33,8 +33,8 @@ and other platforms, see {{ site.product.name }} installation packages.
     - The {{ site.product.short_name }} application now uses PCRE-type regular
         expressions by default. It requires the libpcre library package.
 
-    - If you want to use the Java-based modules of {{ site.product.short_name }} (for
-        example, the Elasticsearch, HDFS, or Kafka destinations), you
+    - If you want to use a Java-based module of {{ site.product.short_name }} (for
+        example, the HDFS), you
         must compile {{ site.product.short_name }} with Java support.
 
         - Download and install the Java Runtime Environment (JRE), 1.7
@@ -59,8 +59,7 @@ and other platforms, see {{ site.product.name }} installation packages.
 3. If you want to post log messages as HTTP requests using the http()
     destination, install the development files of the *libcurl* library.
     This library is not needed if you use the \--disable-http compile
-    option. Alternatively, you can use a Java-based implementation of
-    the HTTP destination.
+    option.
 
 4. If you want to use the spoof-source function of {{ site.product.short_name }}, install
     the development files of the libnet library.

doc/_admin-guide/030_Installing_syslog-ng/001_Compiling_options.md

@@ -54,7 +54,7 @@ compiling options.
 
 - *\--enable-ipv6* Enable IPv6 support.
 
-- *\--enable-java* Enable support for Java-based modules. For other
+- *\--enable-java* Enable support for the Java-based module. For other
     requirements, see the description of the Java-based module (for
     example,
     [[HDFS prerequisites|adm-dest-hdfs-pre]]) that you want to use.
@@ -134,7 +134,7 @@ compiling options.
 
 - *\--with-libcurl* Specifies the path to the libcurl library. For
     details on using this destination, see
-    [[http: Posting messages over HTTP without Java]].
+    [[http: Posting messages over HTTP]].
 
 - *\--with-libhiredis* Specifies the path to the libhiredis library
     (0.11 or newer). For details on using this destination, see

doc/_admin-guide/070_Destinations/070_HDFS/000_hdfs_prerequisites.md

@@ -5,8 +5,8 @@ description: >-
     To send messages from {{ site.product.short_name }} to HDFS, complete the following steps.
 ---
 
-1. If you want to use the Java-based modules of {{ site.product.short_name }} (for
-    example, the Elasticsearch, HDFS, or Kafka destinations), you must
+1. If you want to use the Java-based module of {{ site.product.short_name }} (for
+    example, HDFS destination), you must
     compile {{ site.product.short_name }} with Java support.
 
     - Download and install the Java Runtime Environment (JRE), 1.7 (or

doc/_admin-guide/070_Destinations/081_http/README.md

@@ -4,7 +4,7 @@ short_title: http
 id: adm-dest-http
 description: >-
     Version 3.8 of {{ site.product.short_name }} can directly post log messages to web
-    services using the HTTP protocol, without having to use Java.
+    services using the HTTP protocol.
 ---
 
 The current implementation has the following limitations:

doc/_admin-guide/070_Destinations/085_http-java/000_http_java_options.md

@@ -30,8 +30,6 @@ description: >-
 **Declaration**
 
 ```config
-@define kafka-implementation kafka-c
-
 kafka(
     bootstrap-servers("1.2.3.4:9092,192.168.0.2:9092")
     topic("{MYTOPIC}")

doc/_admin-guide/070_Destinations/085_http-java/README.md

@@ -15,9 +15,7 @@ description: >-
 - The kafka-bootstrap-servers() option has been renamed
     bootstrap-servers().
 
-- The properties-file() is a Java properties file with options that
-    are similar to, but not identical with, the options in the old, Java
-    implementation's properties-file(). For more information, click here. TODO
+- The properties-file() was replaced with the config() option of kafka-c, which is similiar but not identical to the properties-file() option.
 
 - The sync-send() option has been deprecated. Remove it from the
     configuration file.

doc/_admin-guide/070_Destinations/100_Kafka-c/000_Before_you_begin.md

@@ -10,14 +10,7 @@ directly publish log messages to the Apache Kafka message bus, where subscribers
 
 ## Required options
 
-The following options are required: bootstrap-servers(), topic(). Note
-that to use the C implementation of the kafka() destination, you must
-add the following lines to the beginning of your {{ site.product.short_name }}
-configuration:
-
-```config
-@define kafka-implementation kafka-c
-```
+The following options are required: bootstrap-servers(), topic().
 
 {% include doc/admin-guide/notes/kafka-c.md %}
 
@@ -80,8 +73,7 @@ The programming language accepts this option for better compatibility.
 |  Type:|      |
   |Default:|   |
 
-*Description:* You can use this option to expand or override the options
-of the properties-file().
+*Description:* You can use this option to set the properties of the kafka producer.
 
 {% include doc/admin-guide/notes/kafka-c.md %}
 
@@ -154,31 +146,6 @@ client about the amount of messages sent since the last poll-timeout ().
 In case of multithreading, the first {{ site.product.short_name }} worker is responsible for
 poll-timeout().
 
-## properties-file()
-
-|  Type:|      string (absolute path)|
-  |Default:|   N/A|
-
-*Description:* The absolute path and filename of the Kafka properties
-file to load. For example,
-properties-file(\"/opt/syslog-ng/etc/kafka_dest.properties\"). The
-{{ site.product.short_name }} application reads this file and passes the properties to
-the Kafka Producer.
-
-The {{ site.product.short_name }} kafka destination supports all properties of the
-official Kafka producer. For details, see the librdkafka documentation.
-
-The bootstrap-servers option is translated to the bootstrap.servers
-property.
-
-For example, the following properties file defines the acknowledgment
-method and compression:
-
-```config
-acks=all
-compression.type=snappy.
-```
-
 {% include doc/admin-guide/notes/kafka-c.md %}
 
 {% include doc/admin-guide/options/retries.md %}