handle Elasticsearch errors and improve StreamRowsContext

- Updated `StreamRowsContext` function to handle potential errors during Elasticsearch search execution more robustly.
- Improved error handling by checking HTTP status codes and including response body details in error messages.
- Changed function parameter `indexName` to `tableName` for better clarity and consistency.
- Added schema parsing to handle table name resolution correctly.
- Updated Datastream creation to use iop.Columns{} instead of iop.NewColumnsFromFields("data").

core/dbio/database/database_elasticsearch.go

@@ -277,7 +277,7 @@ func (conn *ElasticsearchConn) BulkExportFlow(table Table) (df *iop.Dataflow, er
 	return df, nil
 }
 
-func (conn *ElasticsearchConn) StreamRowsContext(ctx context.Context, indexName string, Opts ...map[string]interface{}) (ds *iop.Datastream, err error) {
+func (conn *ElasticsearchConn) StreamRowsContext(ctx context.Context, tableName string, Opts ...map[string]interface{}) (ds *iop.Datastream, err error) {
 	opts := getQueryOptions(Opts)
 	Limit := int64(0) // infinite
 	if val := cast.ToInt64(opts["limit"]); val > 0 {
@@ -336,6 +336,8 @@ func (conn *ElasticsearchConn) StreamRowsContext(ctx context.Context, indexName
 	}
 
 	// Create the search request
+	table, _ := ParseTableName(tableName, conn.Type)
+	indexName := table.Schema
 	res, err := conn.Client.Search(
 		conn.Client.Search.WithContext(ctx),
 		conn.Client.Search.WithIndex(indexName),
@@ -344,6 +346,9 @@ func (conn *ElasticsearchConn) StreamRowsContext(ctx context.Context, indexName
 	)
 	if err != nil {
 		return nil, g.Error(err, "could not execute search")
+	} else if res.StatusCode >= 400 {
+		bytes, _ := io.ReadAll(res.Body)
+		return nil, g.Error("could not execute search (status %s) => %s", res.StatusCode, string(bytes))
 	}
 
 	var searchResponse map[string]interface{}
@@ -360,7 +365,7 @@ func (conn *ElasticsearchConn) StreamRowsContext(ctx context.Context, indexName
 	}
 
 	// Create base datastream
-	ds = iop.NewDatastreamContext(ctx, iop.NewColumnsFromFields("data"))
+	ds = iop.NewDatastreamContext(ctx, iop.Columns{})
 
 	// Handle flattening option
 	flatten := true