Logstash pipeline does not run from pipelines.yml

I am trying to run logstash:latest container, but pipeline is throwing an error when I run it.

When I run it directly with -f "/path/to/pipeline", everything works. Once I run it from pipelines.yml, it says the pipeline has a bad formatting on the first line, first column.

14:39:28.728 [LogStash::Runner] ERROR logstash.agent - Cannot create pipeline {:reason=>"Expected one of #, input, filter, output at line 1, column 1 (byte 1) after "}

NOTE: Before I even had a comment on the first line and it said the error is after comment, so file access and path are definitely okay.

If anyone has an idea to how or why I am experiencing this behavior, I am open to suggestions. At the bottom I am including my configurations.

pipelines.yml

- pipeline.id: log-pipeline
  path.config: "/etc/logstash/pipelines/log_elastic_write.conf"
  pipeline.workers: 1

log_elastic_write.conf

input { 
        kafka {
                bootstrap_servers => "kafka:9092"
                topics => ["logs"]
                group_id => "logs_write"
                auto_offset_reset => "earliest"
        }
}
filter {
        date {
                match => [ "timestamp" , "yyyy-MM-dd HH:mm:ss.SSSSSS" ]
                timezone => "UTC"
        }
}
filter {
        json {
                source => "message"
        }
}
filter {
        json {
                source => "message"
                target => "raw_message"
        }

        mutate {
                rename => {"@timestamp" => "timestamp_message_received"}
        }

        mutate {
                remove_field => [ "message" ]
                rename => {"[raw_message][timestamp]" => "timestamp_message_sent"}
        }
}
filter {
        date {
                match => ["timestamp_message_sent","yyyy-MM-dd HH:mm:ss.SSS"]
                target => "timestamp_message_sent"
                locale => "en"
        }
}
filter {
        mutate { remove_field => [ "raw_message" ] }
        mutate { remove_field => [ "timestamp" ] }
}
output {
        elasticsearch {
                hosts => "ipelastic:82"
                index => "logging"
        }
}

entrypoint.sh

#!/usr/bin/env bash

echo 'Inspecting file structure'
find /etc/logstash/ -maxdepth 4 | grep -v git | grep -v idea

echo 'Setting up runtime and pipeline configuration files(entrypoint.sh):'
echo "----------        'logstash.yml'        ----------"
envsubst < "${LOGSTASH_DIR_TARGET}/${LOGSTASH_CONFIG_SOURCE}" > "${LOGSTASH_DIR_TARGET}/${LOGSTASH_CONFIG_TARGET}"
rm "${LOGSTASH_DIR_TARGET}/${LOGSTASH_CONFIG_SOURCE}"

echo "----------        'pipelines.yml'        ----------"
envsubst < "${LOGSTASH_DIR_TARGET}/${PIPELINES_CONFIG_SOURCE}" > "${LOGSTASH_DIR_TARGET}/${PIPELINES_CONFIG_TARGET}"
rm "${LOGSTASH_DIR_TARGET}/${PIPELINES_CONFIG_SOURCE}"
less "${LOGSTASH_DIR_TARGET}/${PIPELINES_CONFIG_TARGET}"

echo "---------- pipeline: elasticsearch logs ----------"
envsubst < "${PIPELINE_DIR_TARGET}/${LOG_WRITE_PIPELINE_SOURCE}" > "${PIPELINE_DIR_TARGET}/${LOG_WRITE_PIPELINE_TARGET}"
rm "${PIPELINE_DIR_TARGET}/${LOG_WRITE_PIPELINE_SOURCE}"
less "${PIPELINE_DIR_TARGET}/${LOG_WRITE_PIPELINE_TARGET}"

chmod a+rx "${LOGSTASH_DIR_TARGET}/${LOGSTASH_CONFIG_TARGET}"
chmod a+rx "${LOGSTASH_DIR_TARGET}/${PIPELINES_CONFIG_TARGET}"
chmod a+rx "${PIPELINE_DIR_TARGET}/${LOG_WRITE_PIPELINE_TARGET}"

logstash