log the existing indices instead of entire Metadata and

reduce the number of indices to be auto followed

Relates to elastic#36761

Author: martijnvg

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/AutoFollowIT.java

@@ -145,7 +145,7 @@ public void testAutoFollowManyIndices() throws Exception {
                 assertThat(autoFollowStats[0].getNumberOfSuccessfulFollowIndices(), equalTo(expectedVal1));
             });
         } catch (AssertionError ae) {
-            logger.warn("metadata={}", Strings.toString(metaData[0]));
+            logger.warn("indices={}", Arrays.toString(metaData[0].indices().keys().toArray(String.class)));
             logger.warn("auto follow stats={}", Strings.toString(autoFollowStats[0]));
             throw ae;
         }
@@ -160,15 +160,15 @@ public void testAutoFollowManyIndices() throws Exception {
                 assertThat(autoFollowStats[0].getAutoFollowedClusters().size(), equalTo(0));
             });
         } catch (AssertionError ae) {
-            logger.warn("metadata={}", Strings.toString(metaData[0]));
+            logger.warn("indices={}", Arrays.toString(metaData[0].indices().keys().toArray(String.class)));
             logger.warn("auto follow stats={}", Strings.toString(autoFollowStats[0]));
             throw ae;
         }
         createLeaderIndex("logs-does-not-count", leaderIndexSettings);
 
         putAutoFollowPatterns("my-pattern", new String[] {"logs-*"});
         long i = numIndices;
-        numIndices = numIndices + randomIntBetween(4, 16);
+        numIndices = numIndices + randomIntBetween(4, 8);
         for (; i < numIndices; i++) {
             createLeaderIndex("logs-" + i, leaderIndexSettings);
         }
@@ -185,7 +185,7 @@ public void testAutoFollowManyIndices() throws Exception {
                 assertThat(autoFollowStats[0].getRecentAutoFollowErrors().size(), equalTo(0));
             });
         } catch (AssertionError ae) {
-            logger.warn("metadata={}", Strings.toString(metaData[0]));
+            logger.warn("indices={}", Arrays.toString(metaData[0].indices().keys().toArray(String.class)));
             logger.warn("auto follow stats={}", Strings.toString(autoFollowStats[0]));
             throw ae;
         }