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This new study gives further support for the role of the appendix as a "natural reservoir for 'good' bacteria". The researchers found that a network of immune cells (innate lymphoid cells or ILCs)  safeguard the appendix during a bacterial attack and help the appendix "reseed" the gut microbiome. They also said that a person's diet, such as the proteins in leafy green vegetables, could help produce ILCs. Note that while it is thought that this applies to humans, the research was done on mice. From Medical Xpress:

Immune cells make appendix 'silent hero' of digestive health

New research shows a network of immune cells helps the appendix to play a pivotal role in maintaining the health of the digestive system, supporting the theory that the appendix isn't a vestigial—or redundant—organ.

The research team....found that innate lymphoid cells (ILCs) are crucial for protecting against bacterial infection in people with compromised immune systems. By preventing significant damage and inflammation of the appendix during a bacterial attack, ILCs safeguard the organ and help it to perform an important function in the body, as a natural reservoir for 'good' bacteria.

"Popular belief tells us the appendix is a liability," she said. "Its removal is one of the most common surgical procedures in Australia, with more than 70,000 operations each year. However, we may wish to rethink whether the appendix is so irrelevant for our health. "We've found that ILCs may help the appendix to potentially reseed 'good' bacteria within the microbiome—or community of bacteria—in the body. A balanced microbiome is essential for recovery from bacterial threats to gut health, such as food poisoning."

Professor Belz said having a healthy appendix might even save people from having to stomach more extreme options for repopulating—or 'balancing out'—their microbiomes. "In certain cases, people require reseeding of their intestines with healthy bacteria by faecal transplant—a process where intestinal bacteria is transplanted to a sick person from a healthy individual," Professor Belz said. "Our research suggests ILCs may be able to play this important part in maintaining the integrity of the appendix.

"We found ILCs are part of a multi-layered protective armoury of immune cells that exist in healthy individuals. So even when one layer is depleted, the body has 'back ups' that can fight the infection. "In people who have compromised immune systems—such as people undergoing cancer treatment—these cells are vital for fighting bacterial infections in the gastrointestinal system. This is particularly important because ILCs are able to survive in the gut even during these treatments, which typically wipe out other immune cells."

Professor Belz has previously shown that diet, such as the proteins in leafy green vegetables, could help produce ILCs."ILCs are also known to play a role in allergic diseases, such as asthma; inflammatory bowel disease; and psoriasis," she said. "So it is vital that we better understand their role in the intestine and how we might manipulate this population to treat disease, or promote better health."

Drawing of colon seen from front (appendix is colored red). From Wikipedia.