fix(splunk_hec sink): disable compression in HEC indexer ack queries (#23560)

* Force compression to be disabled in HEC indexer ack queries

* Add changelog fragment

* Add future work issue link comment

* cargo fmt again

---------

Co-authored-by: Pavlos Rontidis <[email protected]>

Author: sbalmos

changelog.d/23559_fix_splunk_hec_ack_compression.fix.md

@@ -0,0 +1,3 @@
+Fixes the `splunk_hec` sink to not use compression on indexer acknowledgement queries.
+
+authors: sbalmos

src/sinks/splunk_hec/common/acknowledgements.rs

@@ -18,6 +18,7 @@ use crate::{
         SplunkIndexerAcknowledgementAPIError, SplunkIndexerAcknowledgementAckAdded,
         SplunkIndexerAcknowledgementAcksRemoved,
     },
+    sinks::util::Compression,
 };
 
 /// Splunk HEC acknowledgement configuration.
@@ -95,6 +96,12 @@ impl HecAckClient {
         client: HttpClient,
         http_request_builder: Arc<HttpRequestBuilder>,
     ) -> Self {
+        // Reimplement with compression support, see https://github.com/vectordotdev/vector/issues/23748
+        let http_request_builder = Arc::new(HttpRequestBuilder {
+            compression: Compression::None,
+            ..(*http_request_builder).clone()
+        });
+
         Self {
             acks: HashMap::new(),
             retry_limit,

src/sinks/splunk_hec/common/service.rs

@@ -177,6 +177,7 @@ impl ResponseExt for http::Response<Bytes> {
     }
 }
 
+#[derive(Clone)]
 pub struct HttpRequestBuilder {
     pub endpoint_target: EndpointTarget,
     pub endpoint: String,